[{"data":1,"prerenderedAt":2984},["ShallowReactive",2],{"blog-post-\u002Fko\u002Fjavascript-nullish-coalescing-optional-chaining":3,"blog-related-source":2635},{"id":4,"title":5,"body":6,"description":2623,"extension":2624,"meta":2625,"navigation":72,"path":2630,"seo":2631,"sitemap":2632,"stem":2633,"__hash__":2634},"ko\u002Fko\u002Fjavascript-nullish-coalescing-optional-chaining.md","자바스크립트 ?? vs || 완벽 정리: null, undefined, 0, 빈 문자열을 올바르게 처리하는 법",{"type":7,"value":8,"toc":2602},"minimark",[9,14,18,136,139,147,157,221,224,233,260,293,405,408,1380,1401,1403,1410,1413,1444,1461,1489,1502,1564,1617,1642,1644,1657,1660,1725,1800,1814,1816,1822,1836,1933,1936,1997,2009,2046,2109,2111,2115,2128,2145,2205,2220,2224,2310,2318,2324,2388,2406,2414,2460,2463,2465,2469,2577,2598],[10,11,13],"h2",{"id":12},"볼륨을-0으로-했는데-왜-50이-되지","볼륨을 0으로 했는데 왜 50이 되지?",[15,16,17],"p",{},"사용자 설정을 불러와서, 값이 없으면 기본값을 쓰는 흔한 코드다.",[19,20,25],"pre",{"className":21,"code":22,"language":23,"meta":24,"style":24},"language-js shiki shiki-themes github-light github-dark","const settings = { volume: 0, nickname: \"\", darkMode: false };\n\nconst volume = settings.volume || 50;\nconst nickname = settings.nickname || \"익명\";\nconst darkMode = settings.darkMode || true;\n","js","",[26,27,28,67,74,96,116],"code",{"__ignoreMap":24},[29,30,33,37,41,44,48,51,54,58,61,64],"span",{"class":31,"line":32},"line",1,[29,34,36],{"class":35},"szBVR","const",[29,38,40],{"class":39},"sj4cs"," settings",[29,42,43],{"class":35}," =",[29,45,47],{"class":46},"sVt8B"," { volume: ",[29,49,50],{"class":39},"0",[29,52,53],{"class":46},", nickname: ",[29,55,57],{"class":56},"sZZnC","\"\"",[29,59,60],{"class":46},", darkMode: ",[29,62,63],{"class":39},"false",[29,65,66],{"class":46}," };\n",[29,68,70],{"class":31,"line":69},2,[29,71,73],{"emptyLinePlaceholder":72},true,"\n",[29,75,77,79,82,84,87,90,93],{"class":31,"line":76},3,[29,78,36],{"class":35},[29,80,81],{"class":39}," volume",[29,83,43],{"class":35},[29,85,86],{"class":46}," settings.volume ",[29,88,89],{"class":35},"||",[29,91,92],{"class":39}," 50",[29,94,95],{"class":46},";\n",[29,97,99,101,104,106,109,111,114],{"class":31,"line":98},4,[29,100,36],{"class":35},[29,102,103],{"class":39}," nickname",[29,105,43],{"class":35},[29,107,108],{"class":46}," settings.nickname ",[29,110,89],{"class":35},[29,112,113],{"class":56}," \"익명\"",[29,115,95],{"class":46},[29,117,119,121,124,126,129,131,134],{"class":31,"line":118},5,[29,120,36],{"class":35},[29,122,123],{"class":39}," darkMode",[29,125,43],{"class":35},[29,127,128],{"class":46}," settings.darkMode ",[29,130,89],{"class":35},[29,132,133],{"class":39}," true",[29,135,95],{"class":46},[15,137,138],{},"결과는 이렇다.",[19,140,145],{"className":141,"code":143,"language":144},[142],"language-text","50      \u002F\u002F 사용자가 일부러 0으로 맞춘 볼륨이 50으로\n\"익명\"  \u002F\u002F 비워둔 닉네임이 \"익명\"으로\ntrue    \u002F\u002F 꺼둔 다크 모드가 켜짐\n","text",[26,146,143],{"__ignoreMap":24},[15,148,149,150,152,153,156],{},"사용자가 고른 값 세 개가 전부 무시됐다. 원인은 ",[26,151,89],{},"이고, 해결책은 ",[26,154,155],{},"??","다.",[19,158,160],{"className":21,"code":159,"language":23,"meta":24,"style":24},"const volume = settings.volume ?? 50; \u002F\u002F 0\nconst nickname = settings.nickname ?? \"익명\"; \u002F\u002F \"\"\nconst darkMode = settings.darkMode ?? true; \u002F\u002F false\n",[26,161,162,183,202],{"__ignoreMap":24},[29,163,164,166,168,170,172,174,176,179],{"class":31,"line":32},[29,165,36],{"class":35},[29,167,81],{"class":39},[29,169,43],{"class":35},[29,171,86],{"class":46},[29,173,155],{"class":35},[29,175,92],{"class":39},[29,177,178],{"class":46},"; ",[29,180,182],{"class":181},"sJ8bj","\u002F\u002F 0\n",[29,184,185,187,189,191,193,195,197,199],{"class":31,"line":69},[29,186,36],{"class":35},[29,188,103],{"class":39},[29,190,43],{"class":35},[29,192,108],{"class":46},[29,194,155],{"class":35},[29,196,113],{"class":56},[29,198,178],{"class":46},[29,200,201],{"class":181},"\u002F\u002F \"\"\n",[29,203,204,206,208,210,212,214,216,218],{"class":31,"line":76},[29,205,36],{"class":35},[29,207,123],{"class":39},[29,209,43],{"class":35},[29,211,128],{"class":46},[29,213,155],{"class":35},[29,215,133],{"class":39},[29,217,178],{"class":46},[29,219,220],{"class":181},"\u002F\u002F false\n",[222,223],"hr",{},[10,225,227,229,230,232],{"id":226},"와-의-차이",[26,228,89],{},"와 ",[26,231,155],{},"의 차이",[234,235,236],"blockquote",{},[15,237,238,240,241,245,246,248,249,259],{},[26,239,89],{},"는 왼쪽 값이 ",[242,243,244],"strong",{},"falsy","면 오른쪽을 쓴다. ",[26,247,155],{},"(널 병합 연산자, Nullish Coalescing)는 왼쪽 값이 ",[242,250,251,254,255,258],{},[26,252,253],{},"null"," 또는 ",[26,256,257],{},"undefined","일 때만"," 오른쪽을 쓴다.",[15,261,262,263,265,266,265,268,270,271,265,274,265,276,278,279,281,282,265,284,265,286,288,289,292],{},"자바스크립트에서 falsy 값은 ",[26,264,63],{},", ",[26,267,50],{},[26,269,57],{},"(빈 문자열), ",[26,272,273],{},"NaN",[26,275,253],{},[26,277,257],{},"다. ",[26,280,89],{},"는 이 여섯 개를 모두 \"값 없음\"으로 취급한다. 그런데 ",[26,283,50],{},[26,285,57],{},[26,287,63],{},"는 대부분 ",[242,290,291],{},"정상적인 값","이다.",[294,295,296,316],"table",{},[297,298,299],"thead",{},[300,301,302,306,311],"tr",{},[303,304,305],"th",{},"왼쪽 값",[303,307,308],{},[26,309,310],{},"값 || \"기본값\"",[303,312,313],{},[26,314,315],{},"값 ?? \"기본값\"",[317,318,319,335,349,363,377,391],"tbody",{},[300,320,321,326,331],{},[322,323,324],"td",{},[26,325,50],{},[322,327,328],{},[26,329,330],{},"\"기본값\"",[322,332,333],{},[26,334,50],{},[300,336,337,341,345],{},[322,338,339],{},[26,340,57],{},[322,342,343],{},[26,344,330],{},[322,346,347],{},[26,348,57],{},[300,350,351,355,359],{},[322,352,353],{},[26,354,63],{},[322,356,357],{},[26,358,330],{},[322,360,361],{},[26,362,63],{},[300,364,365,369,373],{},[322,366,367],{},[26,368,273],{},[322,370,371],{},[26,372,330],{},[322,374,375],{},[26,376,273],{},[300,378,379,383,387],{},[322,380,381],{},[26,382,253],{},[322,384,385],{},[26,386,330],{},[322,388,389],{},[26,390,330],{},[300,392,393,397,401],{},[322,394,395],{},[26,396,257],{},[322,398,399],{},[26,400,330],{},[322,402,403],{},[26,404,330],{},[15,406,407],{},"아래 미리보기에서 값을 하나씩 눌러보며 직접 비교해보자.",[409,410,411,483,788],"code-group",{},[19,412,416],{"className":413,"code":414,"language":415,"meta":24,"style":24},"language-html shiki shiki-themes github-light github-dark","\u003Cdiv class=\"values\">\u003C\u002Fdiv>\n\u003Ctable>\n  \u003Ctbody id=\"rows\">\u003C\u002Ftbody>\n\u003C\u002Ftable>\n","html",[26,417,418,445,453,474],{"__ignoreMap":24},[29,419,420,423,427,431,434,437,440,442],{"class":31,"line":32},[29,421,422],{"class":46},"\u003C",[29,424,426],{"class":425},"s9eBZ","div",[29,428,430],{"class":429},"sScJk"," class",[29,432,433],{"class":46},"=",[29,435,436],{"class":56},"\"values\"",[29,438,439],{"class":46},">\u003C\u002F",[29,441,426],{"class":425},[29,443,444],{"class":46},">\n",[29,446,447,449,451],{"class":31,"line":69},[29,448,422],{"class":46},[29,450,294],{"class":425},[29,452,444],{"class":46},[29,454,455,458,460,463,465,468,470,472],{"class":31,"line":76},[29,456,457],{"class":46},"  \u003C",[29,459,317],{"class":425},[29,461,462],{"class":429}," 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}\n","css",[26,489,490,545,639,677,722,759],{"__ignoreMap":24},[29,491,492,495,498,501,504,507,509,512,514,517,519,522,524,527,530,532,535,537,540,542],{"class":31,"line":32},[29,493,494],{"class":429},".values",[29,496,497],{"class":46}," { ",[29,499,500],{"class":39},"display",[29,502,503],{"class":46},": ",[29,505,506],{"class":39},"flex",[29,508,178],{"class":46},[29,510,511],{"class":39},"flex-wrap",[29,513,503],{"class":46},[29,515,516],{"class":39},"wrap",[29,518,178],{"class":46},[29,520,521],{"class":39},"gap",[29,523,503],{"class":46},[29,525,526],{"class":39},"6",[29,528,529],{"class":35},"px",[29,531,178],{"class":46},[29,533,534],{"class":39},"margin-bottom",[29,536,503],{"class":46},[29,538,539],{"class":39},"14",[29,541,529],{"class":35},[29,543,544],{"class":46},"; 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btn);\n});\n",[26,792,793,840,896,908,946,977,1001,1027,1049,1054,1059,1084,1105,1149,1164,1185,1238,1252,1258,1282,1304,1317,1341,1352,1374],{"__ignoreMap":24},[29,794,795,797,800,802,805,807,809,811,813,815,817,819,821,823,825,827,829,832,834,837],{"class":31,"line":32},[29,796,36],{"class":35},[29,798,799],{"class":39}," values",[29,801,43],{"class":35},[29,803,804],{"class":46}," [",[29,806,50],{"class":39},[29,808,265],{"class":46},[29,810,57],{"class":56},[29,812,265],{"class":46},[29,814,63],{"class":39},[29,816,265],{"class":46},[29,818,273],{"class":39},[29,820,265],{"class":46},[29,822,253],{"class":39},[29,824,265],{"class":46},[29,826,257],{"class":39},[29,828,265],{"class":46},[29,830,831],{"class":56},"\"hello\"",[29,833,265],{"class":46},[29,835,836],{"class":39},"42",[29,838,839],{"class":46},"];\n",[29,841,842,844,847,849,852,856,859,862,864,867,870,873,876,879,882,884,887,890,893],{"class":31,"line":69},[29,843,36],{"class":35},[29,845,846],{"class":429}," 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",[29,917,918],{"class":39},"\\\"",[29,920,921],{"class":56},"기본값",[29,923,918],{"class":39},[29,925,926],{"class":56},"\"",[29,928,929],{"class":46},", (",[29,931,855],{"class":854},[29,933,858],{"class":46},[29,935,861],{"class":35},[29,937,869],{"class":46},[29,939,89],{"class":35},[29,941,942],{"class":56}," \"기본값\"",[29,944,945],{"class":46},"],\n",[29,947,948,950,953,955,957,959,961,963,965,967,969,971,973,975],{"class":31,"line":118},[29,949,912],{"class":46},[29,951,952],{"class":56},"\"v ?? ",[29,954,918],{"class":39},[29,956,921],{"class":56},[29,958,918],{"class":39},[29,960,926],{"class":56},[29,962,929],{"class":46},[29,964,855],{"class":854},[29,966,858],{"class":46},[29,968,861],{"class":35},[29,970,869],{"class":46},[29,972,155],{"class":35},[29,974,942],{"class":56},[29,976,945],{"class":46},[29,978,979,981,984,986,988,990,992,995,998],{"class":31,"line":761},[29,980,912],{"class":46},[29,982,983],{"class":56},"\"v?.toString()\"",[29,985,929],{"class":46},[29,987,855],{"class":854},[29,989,858],{"class":46},[29,991,861],{"class":35},[29,993,994],{"class":46}," v?.",[29,996,997],{"class":429},"toString",[29,999,1000],{"class":46},"()],\n",[29,1002,1004,1006,1009,1011,1013,1015,1017,1019,1022,1025],{"class":31,"line":1003},7,[29,1005,912],{"class":46},[29,1007,1008],{"class":56},"\"v == null\"",[29,1010,929],{"class":46},[29,1012,855],{"class":854},[29,1014,858],{"class":46},[29,1016,861],{"class":35},[29,1018,869],{"class":46},[29,1020,1021],{"class":35},"==",[29,1023,1024],{"class":39}," null",[29,1026,945],{"class":46},[29,1028,1030,1032,1035,1037,1039,1041,1043,1046],{"class":31,"line":1029},8,[29,1031,912],{"class":46},[29,1033,1034],{"class":56},"\"Boolean(v)\"",[29,1036,929],{"class":46},[29,1038,855],{"class":854},[29,1040,858],{"class":46},[29,1042,861],{"class":35},[29,1044,1045],{"class":429}," Boolean",[29,1047,1048],{"class":46},"(v)],\n",[29,1050,1052],{"class":31,"line":1051},9,[29,1053,839],{"class":46},[29,1055,1057],{"class":31,"line":1056},10,[29,1058,73],{"emptyLinePlaceholder":72},[29,1060,1062,1064,1067,1069,1072,1075,1078,1081],{"class":31,"line":1061},11,[29,1063,36],{"class":35},[29,1065,1066],{"class":39}," box",[29,1068,43],{"class":35},[29,1070,1071],{"class":46}," document.",[29,1073,1074],{"class":429},"querySelector",[29,1076,1077],{"class":46},"(",[29,1079,1080],{"class":56},"\".values\"",[29,1082,1083],{"class":46},");\n",[29,1085,1087,1090,1093,1095,1097,1099,1102],{"class":31,"line":1086},12,[29,1088,1089],{"class":35},"function",[29,1091,1092],{"class":429}," select",[29,1094,1077],{"class":46},[29,1096,855],{"class":854},[29,1098,265],{"class":46},[29,1100,1101],{"class":854},"btn",[29,1103,1104],{"class":46},") {\n",[29,1106,1108,1111,1114,1116,1119,1122,1125,1128,1131,1133,1135,1138,1141,1143,1146],{"class":31,"line":1107},13,[29,1109,1110],{"class":46},"  box.",[29,1112,1113],{"class":429},"querySelectorAll",[29,1115,1077],{"class":46},[29,1117,1118],{"class":56},"\"button\"",[29,1120,1121],{"class":46},").",[29,1123,1124],{"class":429},"forEach",[29,1126,1127],{"class":46},"((",[29,1129,1130],{"class":854},"b",[29,1132,858],{"class":46},[29,1134,861],{"class":35},[29,1136,1137],{"class":46}," b.classList.",[29,1139,1140],{"class":429},"remove",[29,1142,1077],{"class":46},[29,1144,1145],{"class":56},"\"active\"",[29,1147,1148],{"class":46},"));\n",[29,1150,1152,1155,1158,1160,1162],{"class":31,"line":1151},14,[29,1153,1154],{"class":46},"  btn.classList.",[29,1156,1157],{"class":429},"add",[29,1159,1077],{"class":46},[29,1161,1145],{"class":56},[29,1163,1083],{"class":46},[29,1165,1167,1170,1172,1174,1177,1180,1182],{"class":31,"line":1166},15,[29,1168,1169],{"class":46},"  document.",[29,1171,1074],{"class":429},[29,1173,1077],{"class":46},[29,1175,1176],{"class":56},"\"#rows\"",[29,1178,1179],{"class":46},").innerHTML ",[29,1181,433],{"class":35},[29,1183,1184],{"class":46}," checks\n",[29,1186,1188,1191,1194,1197,1200,1202,1205,1208,1210,1213,1215,1218,1221,1223,1225,1227,1229,1232,1235],{"class":31,"line":1187},16,[29,1189,1190],{"class":46},"    .",[29,1192,1193],{"class":429},"map",[29,1195,1196],{"class":46},"(([",[29,1198,1199],{"class":854},"label",[29,1201,265],{"class":46},[29,1203,1204],{"class":854},"fn",[29,1206,1207],{"class":46},"]) ",[29,1209,861],{"class":35},[29,1211,1212],{"class":56}," `\u003Ctr>\u003Ctd>${",[29,1214,1199],{"class":46},[29,1216,1217],{"class":56},"}\u003C\u002Ftd>\u003Ctd>${",[29,1219,1220],{"class":429},"show",[29,1222,1077],{"class":56},[29,1224,1204],{"class":429},[29,1226,1077],{"class":56},[29,1228,855],{"class":46},[29,1230,1231],{"class":56},"))",[29,1233,1234],{"class":56},"}\u003C\u002Ftd>\u003C\u002Ftr>`",[29,1236,1237],{"class":46},")\n",[29,1239,1241,1243,1246,1248,1250],{"class":31,"line":1240},17,[29,1242,1190],{"class":46},[29,1244,1245],{"class":429},"join",[29,1247,1077],{"class":46},[29,1249,57],{"class":56},[29,1251,1083],{"class":46},[29,1253,1255],{"class":31,"line":1254},18,[29,1256,1257],{"class":46},"}\n",[29,1259,1261,1264,1266,1268,1270,1272,1275,1277,1279],{"class":31,"line":1260},19,[29,1262,1263],{"class":46},"values.",[29,1265,1124],{"class":429},[29,1267,1127],{"class":46},[29,1269,855],{"class":854},[29,1271,265],{"class":46},[29,1273,1274],{"class":854},"i",[29,1276,858],{"class":46},[29,1278,861],{"class":35},[29,1280,1281],{"class":46}," {\n",[29,1283,1285,1288,1291,1293,1295,1298,1300,1302],{"class":31,"line":1284},20,[29,1286,1287],{"class":35},"  const",[29,1289,1290],{"class":39}," btn",[29,1292,43],{"class":35},[29,1294,1071],{"class":46},[29,1296,1297],{"class":429},"createElement",[29,1299,1077],{"class":46},[29,1301,1118],{"class":56},[29,1303,1083],{"class":46},[29,1305,1307,1310,1312,1314],{"class":31,"line":1306},21,[29,1308,1309],{"class":46},"  btn.textContent ",[29,1311,433],{"class":35},[29,1313,846],{"class":429},[29,1315,1316],{"class":46},"(v);\n",[29,1318,1320,1323,1326,1328,1331,1334,1336,1338],{"class":31,"line":1319},22,[29,1321,1322],{"class":46},"  btn.",[29,1324,1325],{"class":429},"addEventListener",[29,1327,1077],{"class":46},[29,1329,1330],{"class":56},"\"click\"",[29,1332,1333],{"class":46},", () ",[29,1335,861],{"class":35},[29,1337,1092],{"class":429},[29,1339,1340],{"class":46},"(v, btn));\n",[29,1342,1344,1346,1349],{"class":31,"line":1343},23,[29,1345,1110],{"class":46},[29,1347,1348],{"class":429},"append",[29,1350,1351],{"class":46},"(btn);\n",[29,1353,1355,1358,1361,1363,1366,1368,1371],{"class":31,"line":1354},24,[29,1356,1357],{"class":35},"  if",[29,1359,1360],{"class":46}," (i ",[29,1362,872],{"class":35},[29,1364,1365],{"class":39}," 0",[29,1367,858],{"class":46},[29,1369,1370],{"class":429},"select",[29,1372,1373],{"class":46},"(v, btn);\n",[29,1375,1377],{"class":31,"line":1376},25,[29,1378,1379],{"class":46},"});\n",[1381,1382,1383],"tip",{},[234,1384,1385],{},[15,1386,1387,1388,1391,1392,1394,1395,1397,1398,1400],{},"기준은 하나다. ",[242,1389,1390],{},"\"0, 빈 문자열, false도 정상적인 값인가?\""," 그렇다면 ",[26,1393,155],{},", 아니라면(빈 값도 기본값으로 바꾸고 싶다면) ",[26,1396,89],{},"를 쓴다. 대부분의 설정값, 숫자, 폼 입력에는 ",[26,1399,155],{},"가 맞다.",[222,1402],{},[10,1404,1406,1409],{"id":1405},"옵셔널-체이닝-중간에-값이-없어도-터지지-않게",[26,1407,1408],{},"?."," 옵셔널 체이닝: 중간에 값이 없어도 터지지 않게",[15,1411,1412],{},"API 응답처럼 중간 단계가 비어 있을 수 있는 객체를 다룰 때 가장 흔한 에러가 이것이다.",[19,1414,1416],{"className":21,"code":1415,"language":23,"meta":24,"style":24},"const user = { profile: null };\nuser.profile.name;\n\u002F\u002F TypeError: Cannot read properties of null (reading 'name')\n",[26,1417,1418,1434,1439],{"__ignoreMap":24},[29,1419,1420,1422,1425,1427,1430,1432],{"class":31,"line":32},[29,1421,36],{"class":35},[29,1423,1424],{"class":39}," user",[29,1426,43],{"class":35},[29,1428,1429],{"class":46}," { profile: ",[29,1431,253],{"class":39},[29,1433,66],{"class":46},[29,1435,1436],{"class":31,"line":69},[29,1437,1438],{"class":46},"user.profile.name;\n",[29,1440,1441],{"class":31,"line":76},[29,1442,1443],{"class":181},"\u002F\u002F TypeError: Cannot read properties of null (reading 'name')\n",[15,1445,1446,1448,1449,1451,1452,1454,1455],{},[26,1447,1408],{},"(옵셔널 체이닝, Optional Chaining)는 앞의 값이 ",[26,1450,253],{},"이나 ",[26,1453,257],{},"면 ",[242,1456,1457,1458,1460],{},"에러 대신 ",[26,1459,257],{},"를 돌려주고 멈춘다.",[19,1462,1464],{"className":21,"code":1463,"language":23,"meta":24,"style":24},"user.profile?.name; \u002F\u002F undefined\nuser.profile?.name ?? \"이름 없음\"; \u002F\u002F \"이름 없음\"\n",[26,1465,1466,1474],{"__ignoreMap":24},[29,1467,1468,1471],{"class":31,"line":32},[29,1469,1470],{"class":46},"user.profile?.name; ",[29,1472,1473],{"class":181},"\u002F\u002F undefined\n",[29,1475,1476,1479,1481,1484,1486],{"class":31,"line":69},[29,1477,1478],{"class":46},"user.profile?.name ",[29,1480,155],{"class":35},[29,1482,1483],{"class":56}," \"이름 없음\"",[29,1485,178],{"class":46},[29,1487,1488],{"class":181},"\u002F\u002F \"이름 없음\"\n",[15,1490,1491,229,1493,1495,1496,1498,1499,1501],{},[26,1492,1408],{},[26,1494,155],{},"는 짝꿍처럼 함께 쓰인다. ",[26,1497,1408],{},"로 안전하게 꺼내고, ",[26,1500,155],{},"로 기본값을 채운다.",[294,1503,1504,1517],{},[297,1505,1506],{},[300,1507,1508,1511,1514],{},[303,1509,1510],{},"쓰는 곳",[303,1512,1513],{},"문법",[303,1515,1516],{},"예시",[317,1518,1519,1534,1549],{},[300,1520,1521,1524,1529],{},[322,1522,1523],{},"속성",[322,1525,1526],{},[26,1527,1528],{},"obj?.prop",[322,1530,1531],{},[26,1532,1533],{},"user?.name",[300,1535,1536,1539,1544],{},[322,1537,1538],{},"대괄호 접근",[322,1540,1541],{},[26,1542,1543],{},"obj?.[key]",[322,1545,1546],{},[26,1547,1548],{},"order.items?.[0]",[300,1550,1551,1554,1559],{},[322,1552,1553],{},"함수 호출",[322,1555,1556],{},[26,1557,1558],{},"fn?.()",[322,1560,1561],{},[26,1562,1563],{},"options.onSuccess?.()",[19,1565,1567],{"className":21,"code":1566,"language":23,"meta":24,"style":24},"\u002F\u002F 콜백이 있을 때만 호출\noptions.onSuccess?.(result);\n\n\u002F\u002F 장바구니 첫 상품 가격, 없으면 0\nconst firstPrice = order.items?.[0]?.price ?? 0;\n",[26,1568,1569,1574,1585,1589,1594],{"__ignoreMap":24},[29,1570,1571],{"class":31,"line":32},[29,1572,1573],{"class":181},"\u002F\u002F 콜백이 있을 때만 호출\n",[29,1575,1576,1579,1582],{"class":31,"line":69},[29,1577,1578],{"class":46},"options.",[29,1580,1581],{"class":429},"onSuccess",[29,1583,1584],{"class":46},"?.(result);\n",[29,1586,1587],{"class":31,"line":76},[29,1588,73],{"emptyLinePlaceholder":72},[29,1590,1591],{"class":31,"line":98},[29,1592,1593],{"class":181},"\u002F\u002F 장바구니 첫 상품 가격, 없으면 0\n",[29,1595,1596,1598,1601,1603,1606,1608,1611,1613,1615],{"class":31,"line":118},[29,1597,36],{"class":35},[29,1599,1600],{"class":39}," firstPrice",[29,1602,43],{"class":35},[29,1604,1605],{"class":46}," order.items?.[",[29,1607,50],{"class":39},[29,1609,1610],{"class":46},"]?.price ",[29,1612,155],{"class":35},[29,1614,1365],{"class":39},[29,1616,95],{"class":46},[1618,1619,1620],"warning",{},[234,1621,1622],{},[15,1623,1624,1626,1627,1630,1631,1634,1635,1638,1639,1641],{},[26,1625,1408],{},"를 모든 점(",[26,1628,1629],{},".",")마다 습관적으로 붙이지 말자. ",[26,1632,1633],{},"res?.data?.user?.address?.city","처럼 쓰면, ",[242,1636,1637],{},"절대 비어 있으면 안 되는 값","이 비어 있어도 조용히 ",[26,1640,257],{},"가 되어 버그가 숨는다. 실제로 비어 있을 수 있는 단계에만 붙여야, 있어야 할 값이 없을 때 에러로 빨리 발견할 수 있다.",[222,1643],{},[10,1645,1647,265,1650,265,1653,1656],{"id":1646},"값이-없을-때만-채우기",[26,1648,1649],{},"??=",[26,1651,1652],{},"||=",[26,1654,1655],{},"&&=",": 값이 없을 때만 채우기",[15,1658,1659],{},"논리 할당 연산자(Logical Assignment)는 \"조건이 맞을 때만 대입\"을 짧게 쓴다.",[19,1661,1663],{"className":21,"code":1662,"language":23,"meta":24,"style":24},"const config = { retries: 0, timeout: undefined };\n\nconfig.retries ??= 3; \u002F\u002F 0은 그대로 (null\u002Fundefined가 아니니까)\nconfig.timeout ??= 5000; \u002F\u002F undefined라서 5000이 들어감\n\u002F\u002F { retries: 0, timeout: 5000 }\n",[26,1664,1665,1686,1690,1705,1720],{"__ignoreMap":24},[29,1666,1667,1669,1672,1674,1677,1679,1682,1684],{"class":31,"line":32},[29,1668,36],{"class":35},[29,1670,1671],{"class":39}," config",[29,1673,43],{"class":35},[29,1675,1676],{"class":46}," { retries: ",[29,1678,50],{"class":39},[29,1680,1681],{"class":46},", timeout: ",[29,1683,257],{"class":39},[29,1685,66],{"class":46},[29,1687,1688],{"class":31,"line":69},[29,1689,73],{"emptyLinePlaceholder":72},[29,1691,1692,1695,1697,1700,1702],{"class":31,"line":76},[29,1693,1694],{"class":46},"config.retries ",[29,1696,1649],{"class":35},[29,1698,1699],{"class":39}," 3",[29,1701,178],{"class":46},[29,1703,1704],{"class":181},"\u002F\u002F 0은 그대로 (null\u002Fundefined가 아니니까)\n",[29,1706,1707,1710,1712,1715,1717],{"class":31,"line":98},[29,1708,1709],{"class":46},"config.timeout ",[29,1711,1649],{"class":35},[29,1713,1714],{"class":39}," 5000",[29,1716,178],{"class":46},[29,1718,1719],{"class":181},"\u002F\u002F undefined라서 5000이 들어감\n",[29,1721,1722],{"class":31,"line":118},[29,1723,1724],{"class":181},"\u002F\u002F { retries: 0, timeout: 5000 }\n",[294,1726,1727,1740],{},[297,1728,1729],{},[300,1730,1731,1734,1737],{},[303,1732,1733],{},"연산자",[303,1735,1736],{},"대입하는 조건",[303,1738,1739],{},"풀어 쓰면",[317,1741,1742,1766,1783],{},[300,1743,1744,1749,1761],{},[322,1745,1746],{},[26,1747,1748],{},"a ??= b",[322,1750,1751,1754,1755,1757,1758,1760],{},[26,1752,1753],{},"a","가 ",[26,1756,253],{},"\u002F",[26,1759,257],{},"일 때",[322,1762,1763],{},[26,1764,1765],{},"a ?? (a = b)",[300,1767,1768,1773,1778],{},[322,1769,1770],{},[26,1771,1772],{},"a ||= b",[322,1774,1775,1777],{},[26,1776,1753],{},"가 falsy일 때",[322,1779,1780],{},[26,1781,1782],{},"a || (a = b)",[300,1784,1785,1790,1795],{},[322,1786,1787],{},[26,1788,1789],{},"a &&= b",[322,1791,1792,1794],{},[26,1793,1753],{},"가 truthy일 때",[322,1796,1797],{},[26,1798,1799],{},"a && (a = b)",[15,1801,1802,1803,1806,1807,1809,1810,1813],{},"여기서도 같은 함정이 있다. ",[26,1804,1805],{},"config.retries ||= 3","이라고 쓰면 사용자가 일부러 정한 ",[26,1808,50],{},"(재시도 안 함)이 ",[26,1811,1812],{},"3","으로 바뀐다.",[222,1815],{},[10,1817,1819,1820,258],{"id":1818},"기본-매개변수와-구조-분해-기본값은-undefined일-때만","기본 매개변수와 구조 분해 기본값은 ",[26,1821,257],{},[15,1823,1824,1825,1827,1828,1832,1833,1835],{},"함수 매개변수의 기본값은 ",[26,1826,155],{},"보다도 범위가 좁다. ",[242,1829,1830,258],{},[26,1831,257],{}," 적용되고, ",[26,1834,253],{},"은 그대로 들어온다.",[19,1837,1839],{"className":21,"code":1838,"language":23,"meta":24,"style":24},"function greet(name = \"손님\") {\n  return `안녕하세요, ${name}!`;\n}\n\ngreet(); \u002F\u002F \"안녕하세요, 손님!\"\ngreet(undefined); \u002F\u002F \"안녕하세요, 손님!\"\ngreet(null); \u002F\u002F \"안녕하세요, null!\"  ← 기본값이 적용되지 않음\ngreet(\"\"); \u002F\u002F \"안녕하세요, !\"\n",[26,1840,1841,1860,1875,1879,1883,1894,1907,1920],{"__ignoreMap":24},[29,1842,1843,1845,1848,1850,1853,1855,1858],{"class":31,"line":32},[29,1844,1089],{"class":35},[29,1846,1847],{"class":429}," greet",[29,1849,1077],{"class":46},[29,1851,1852],{"class":854},"name",[29,1854,43],{"class":35},[29,1856,1857],{"class":56}," \"손님\"",[29,1859,1104],{"class":46},[29,1861,1862,1865,1868,1870,1873],{"class":31,"line":69},[29,1863,1864],{"class":35},"  return",[29,1866,1867],{"class":56}," `안녕하세요, ${",[29,1869,1852],{"class":46},[29,1871,1872],{"class":56},"}!`",[29,1874,95],{"class":46},[29,1876,1877],{"class":31,"line":76},[29,1878,1257],{"class":46},[29,1880,1881],{"class":31,"line":98},[29,1882,73],{"emptyLinePlaceholder":72},[29,1884,1885,1888,1891],{"class":31,"line":118},[29,1886,1887],{"class":429},"greet",[29,1889,1890],{"class":46},"(); ",[29,1892,1893],{"class":181},"\u002F\u002F \"안녕하세요, 손님!\"\n",[29,1895,1896,1898,1900,1902,1905],{"class":31,"line":761},[29,1897,1887],{"class":429},[29,1899,1077],{"class":46},[29,1901,257],{"class":39},[29,1903,1904],{"class":46},"); ",[29,1906,1893],{"class":181},[29,1908,1909,1911,1913,1915,1917],{"class":31,"line":1003},[29,1910,1887],{"class":429},[29,1912,1077],{"class":46},[29,1914,253],{"class":39},[29,1916,1904],{"class":46},[29,1918,1919],{"class":181},"\u002F\u002F \"안녕하세요, null!\"  ← 기본값이 적용되지 않음\n",[29,1921,1922,1924,1926,1928,1930],{"class":31,"line":1029},[29,1923,1887],{"class":429},[29,1925,1077],{"class":46},[29,1927,57],{"class":56},[29,1929,1904],{"class":46},[29,1931,1932],{"class":181},"\u002F\u002F \"안녕하세요, !\"\n",[15,1934,1935],{},"구조 분해(Destructuring)의 기본값도 똑같다.",[19,1937,1939],{"className":21,"code":1938,"language":23,"meta":24,"style":24},"const { page = 1, size = 10 } = { page: null, size: undefined };\npage; \u002F\u002F null (기본값 적용 안 됨)\nsize; \u002F\u002F 10\n",[26,1940,1941,1981,1989],{"__ignoreMap":24},[29,1942,1943,1945,1947,1950,1952,1955,1957,1960,1962,1964,1967,1969,1972,1974,1977,1979],{"class":31,"line":32},[29,1944,36],{"class":35},[29,1946,497],{"class":46},[29,1948,1949],{"class":39},"page",[29,1951,43],{"class":35},[29,1953,1954],{"class":39}," 1",[29,1956,265],{"class":46},[29,1958,1959],{"class":39},"size",[29,1961,43],{"class":35},[29,1963,584],{"class":39},[29,1965,1966],{"class":46}," } ",[29,1968,433],{"class":35},[29,1970,1971],{"class":46}," { page: ",[29,1973,253],{"class":39},[29,1975,1976],{"class":46},", size: ",[29,1978,257],{"class":39},[29,1980,66],{"class":46},[29,1982,1983,1986],{"class":31,"line":69},[29,1984,1985],{"class":46},"page; ",[29,1987,1988],{"class":181},"\u002F\u002F null (기본값 적용 안 됨)\n",[29,1990,1991,1994],{"class":31,"line":76},[29,1992,1993],{"class":46},"size; ",[29,1995,1996],{"class":181},"\u002F\u002F 10\n",[15,1998,1999,2000,2002,2003,2005,2006,2008],{},"API 응답에는 ",[26,2001,253],{},"이 흔히 섞여 온다. ",[26,2004,253],{},"까지 기본값으로 바꾸고 싶다면 기본 매개변수 대신 ",[26,2007,155],{},"를 쓰자.",[19,2010,2012],{"className":21,"code":2011,"language":23,"meta":24,"style":24},"function greet(name) {\n  return `안녕하세요, ${name ?? \"손님\"}!`;\n}\n",[26,2013,2014,2026,2042],{"__ignoreMap":24},[29,2015,2016,2018,2020,2022,2024],{"class":31,"line":32},[29,2017,1089],{"class":35},[29,2019,1847],{"class":429},[29,2021,1077],{"class":46},[29,2023,1852],{"class":854},[29,2025,1104],{"class":46},[29,2027,2028,2030,2032,2034,2037,2040],{"class":31,"line":69},[29,2029,1864],{"class":35},[29,2031,1867],{"class":56},[29,2033,1852],{"class":46},[29,2035,2036],{"class":35}," ??",[29,2038,2039],{"class":56}," \"손님\"}!`",[29,2041,95],{"class":46},[29,2043,2044],{"class":31,"line":76},[29,2045,1257],{"class":46},[294,2047,2048,2071],{},[297,2049,2050],{},[300,2051,2052,2055,2059,2063],{},[303,2053,2054],{},"방법",[303,2056,2057],{},[26,2058,257],{},[303,2060,2061],{},[26,2062,253],{},[303,2064,2065,265,2067,265,2069],{},[26,2066,50],{},[26,2068,57],{},[26,2070,63],{},[317,2072,2073,2085,2097],{},[300,2074,2075,2078,2080,2083],{},[322,2076,2077],{},"기본 매개변수 \u002F 구조 분해 기본값",[322,2079,921],{},[322,2081,2082],{},"그대로",[322,2084,2082],{},[300,2086,2087,2091,2093,2095],{},[322,2088,2089],{},[26,2090,155],{},[322,2092,921],{},[322,2094,921],{},[322,2096,2082],{},[300,2098,2099,2103,2105,2107],{},[322,2100,2101],{},[26,2102,89],{},[322,2104,921],{},[322,2106,921],{},[322,2108,921],{},[222,2110],{},[10,2112,2114],{"id":2113},"값이-없는지-올바르게-검사하기","값이 \"없는지\" 올바르게 검사하기",[2116,2117,2119,2121,2122,2124,2125],"h3",{"id":2118},"null과-undefined를-한-번에-null",[26,2120,253],{},"과 ",[26,2123,257],{},"를 한 번에: ",[26,2126,2127],{},"== null",[15,2129,2130,2131,2133,2134,2141,2142,2144],{},"평소에는 ",[26,2132,872],{},"를 쓰는 게 원칙이지만, ",[242,2135,2136,2121,2138,2140],{},[26,2137,253],{},[26,2139,257],{},"를 함께 검사할 때만큼은"," ",[26,2143,2127],{},"이 짧고 정확하다.",[19,2146,2148],{"className":21,"code":2147,"language":23,"meta":24,"style":24},"value == null; \u002F\u002F value가 null 또는 undefined일 때만 true\n\n0 == null; \u002F\u002F false\n\"\" == null; \u002F\u002F false\nfalse == null; \u002F\u002F false\n",[26,2149,2150,2164,2168,2181,2193],{"__ignoreMap":24},[29,2151,2152,2155,2157,2159,2161],{"class":31,"line":32},[29,2153,2154],{"class":46},"value ",[29,2156,1021],{"class":35},[29,2158,1024],{"class":39},[29,2160,178],{"class":46},[29,2162,2163],{"class":181},"\u002F\u002F value가 null 또는 undefined일 때만 true\n",[29,2165,2166],{"class":31,"line":69},[29,2167,73],{"emptyLinePlaceholder":72},[29,2169,2170,2172,2175,2177,2179],{"class":31,"line":76},[29,2171,50],{"class":39},[29,2173,2174],{"class":35}," ==",[29,2176,1024],{"class":39},[29,2178,178],{"class":46},[29,2180,220],{"class":181},[29,2182,2183,2185,2187,2189,2191],{"class":31,"line":98},[29,2184,57],{"class":56},[29,2186,2174],{"class":35},[29,2188,1024],{"class":39},[29,2190,178],{"class":46},[29,2192,220],{"class":181},[29,2194,2195,2197,2199,2201,2203],{"class":31,"line":118},[29,2196,63],{"class":39},[29,2198,2174],{"class":35},[29,2200,1024],{"class":39},[29,2202,178],{"class":46},[29,2204,220],{"class":181},[15,2206,2207,2210,2211,2121,2213,2215,2216,2219],{},[26,2208,2209],{},"if (!value)","는 ",[26,2212,50],{},[26,2214,57],{},"까지 걸러버리니, \"값이 비어 있는지\"를 볼 때는 ",[26,2217,2218],{},"value == null","이 의도에 더 가깝다.",[2116,2221,2223],{"id":2222},"헷갈리는-타입-검사","헷갈리는 타입 검사",[294,2225,2226,2239],{},[297,2227,2228],{},[300,2229,2230,2233,2236],{},[303,2231,2232],{},"하고 싶은 것",[303,2234,2235],{},"❌ 틀리기 쉬운 방법",[303,2237,2238],{},"✅ 올바른 방법",[317,2240,2241,2256,2280],{},[300,2242,2243,2246,2251],{},[322,2244,2245],{},"배열인지",[322,2247,2248],{},[26,2249,2250],{},"typeof arr === \"object\"",[322,2252,2253],{},[26,2254,2255],{},"Array.isArray(arr)",[300,2257,2258,2263,2275],{},[322,2259,2260,2262],{},[26,2261,253],{},"인지",[322,2264,2265,851,2268,2270,2271,2274],{},[26,2266,2267],{},"typeof v === \"object\"",[26,2269,253],{},"도 ",[26,2272,2273],{},"\"object\"",")",[322,2276,2277],{},[26,2278,2279],{},"v === null",[300,2281,2282,2286,2305],{},[322,2283,2284,2262],{},[26,2285,273],{},[322,2287,2288,2291,2292,2294,2295,2298,2299,2270,2302,2274],{},[26,2289,2290],{},"v === NaN"," (항상 ",[26,2293,63],{},"), ",[26,2296,2297],{},"isNaN(v)"," (문자열 ",[26,2300,2301],{},"\"abc\"",[26,2303,2304],{},"true",[322,2306,2307],{},[26,2308,2309],{},"Number.isNaN(v)",[2116,2311,2313,2210,2315,2317],{"id":2312},"는-nan을-걸러주지-않는다",[26,2314,155],{},[26,2316,273],{},"을 걸러주지 않는다",[15,2319,2320,2321,2323],{},"숫자 변환과 ",[26,2322,155],{},"를 같이 쓸 때 자주 하는 실수다.",[19,2325,2327],{"className":21,"code":2326,"language":23,"meta":24,"style":24},"const qty = Number(\"abc\"); \u002F\u002F NaN\nqty ?? 1; \u002F\u002F NaN  ← NaN은 null\u002Fundefined가 아니라서 그대로\nNumber.isNaN(qty) ? 1 : qty; \u002F\u002F 1\n",[26,2328,2329,2350,2364],{"__ignoreMap":24},[29,2330,2331,2333,2336,2338,2341,2343,2345,2347],{"class":31,"line":32},[29,2332,36],{"class":35},[29,2334,2335],{"class":39}," qty",[29,2337,43],{"class":35},[29,2339,2340],{"class":429}," Number",[29,2342,1077],{"class":46},[29,2344,2301],{"class":56},[29,2346,1904],{"class":46},[29,2348,2349],{"class":181},"\u002F\u002F NaN\n",[29,2351,2352,2355,2357,2359,2361],{"class":31,"line":69},[29,2353,2354],{"class":46},"qty ",[29,2356,155],{"class":35},[29,2358,1954],{"class":39},[29,2360,178],{"class":46},[29,2362,2363],{"class":181},"\u002F\u002F NaN  ← NaN은 null\u002Fundefined가 아니라서 그대로\n",[29,2365,2366,2369,2372,2375,2378,2380,2382,2385],{"class":31,"line":76},[29,2367,2368],{"class":46},"Number.",[29,2370,2371],{"class":429},"isNaN",[29,2373,2374],{"class":46},"(qty) ",[29,2376,2377],{"class":35},"?",[29,2379,1954],{"class":39},[29,2381,889],{"class":35},[29,2383,2384],{"class":46}," qty; ",[29,2386,2387],{"class":181},"\u002F\u002F 1\n",[15,2389,2390,229,2393,2396,2397,2399,2400,2402,2403,2405],{},[26,2391,2392],{},"Number(\"\")",[26,2394,2395],{},"Number(null)","은 ",[26,2398,273],{},"이 아니라 ",[26,2401,50],{},"이 된다는 것도 기억해두자. 빈 입력칸이 조용히 ",[26,2404,50],{},"으로 바뀌는 버그의 원인이다.",[2116,2407,2409,229,2411,2413],{"id":2408},"와-는-괄호-없이-섞을-수-없다",[26,2410,155],{},[26,2412,89],{},"는 괄호 없이 섞을 수 없다",[19,2415,2417],{"className":21,"code":2416,"language":23,"meta":24,"style":24},"null || undefined ?? \"x\"; \u002F\u002F SyntaxError\n(null || undefined) ?? \"x\"; \u002F\u002F \"x\"\n",[26,2418,2419,2439],{"__ignoreMap":24},[29,2420,2421,2423,2426,2429,2431,2434,2436],{"class":31,"line":32},[29,2422,253],{"class":39},[29,2424,2425],{"class":35}," ||",[29,2427,2428],{"class":39}," undefined",[29,2430,2036],{"class":35},[29,2432,2433],{"class":56}," \"x\"",[29,2435,178],{"class":46},[29,2437,2438],{"class":181},"\u002F\u002F SyntaxError\n",[29,2440,2441,2443,2445,2447,2449,2451,2453,2455,2457],{"class":31,"line":69},[29,2442,1077],{"class":46},[29,2444,253],{"class":39},[29,2446,2425],{"class":35},[29,2448,2428],{"class":39},[29,2450,858],{"class":46},[29,2452,155],{"class":35},[29,2454,2433],{"class":56},[29,2456,178],{"class":46},[29,2458,2459],{"class":181},"\u002F\u002F \"x\"\n",[15,2461,2462],{},"어느 쪽을 먼저 계산할지 헷갈리지 않도록 언어 차원에서 막아둔 것이다. 섞어야 한다면 괄호로 순서를 명확히 하자.",[222,2464],{},[10,2466,2468],{"id":2467},"정리-왜-알아두면-좋은가","정리: 왜 알아두면 좋은가",[294,2470,2471,2481],{},[297,2472,2473],{},[300,2474,2475,2478],{},[303,2476,2477],{},"상황",[303,2479,2480],{},"올바른 처리",[317,2482,2483,2498,2508,2518,2527,2536,2548,2561],{},[300,2484,2485,2493],{},[322,2486,2487,2488,265,2490,2492],{},"기본값 넣기 (0, ",[26,2489,57],{},[26,2491,63],{},"도 유효한 값)",[322,2494,2495],{},[26,2496,2497],{},"값 ?? 기본값",[300,2499,2500,2503],{},[322,2501,2502],{},"빈 값까지 전부 기본값으로",[322,2504,2505],{},[26,2506,2507],{},"값 || 기본값",[300,2509,2510,2513],{},[322,2511,2512],{},"중간이 비어 있을 수 있는 객체 접근",[322,2514,2515],{},[26,2516,2517],{},"obj?.a?.b",[300,2519,2520,2523],{},[322,2521,2522],{},"있을 때만 콜백 호출",[322,2524,2525],{},[26,2526,1558],{},[300,2528,2529,2532],{},[322,2530,2531],{},"비어 있을 때만 채우기",[322,2533,2534],{},[26,2535,1748],{},[300,2537,2538,2543],{},[322,2539,2540,2542],{},[26,2541,253],{},"까지 기본값 처리하는 매개변수",[322,2544,2545,2546],{},"기본 매개변수 대신 ",[26,2547,155],{},[300,2549,2550,2557],{},[322,2551,2552,1757,2554,2556],{},[26,2553,253],{},[26,2555,257],{}," 검사",[322,2558,2559],{},[26,2560,2218],{},[300,2562,2563,2568],{},[322,2564,2565,2566,2556],{},"배열 \u002F ",[26,2567,273],{},[322,2569,2570,2573,2574],{},[26,2571,2572],{},"Array.isArray"," \u002F ",[26,2575,2576],{},"Number.isNaN",[15,2578,2579,2581,2582,2584,2585,2588,2589,2591,2592,2594,2595,2597],{},[26,2580,50],{},", 빈 문자열, ",[26,2583,63],{},"는 \"값이 없음\"이 아니라 ",[242,2586,2587],{},"사용자가 고른 값","인 경우가 많다. ",[26,2590,89],{},"로 기본값을 넣는 습관은 이런 값을 조용히 지워버리고, 이런 버그는 에러가 나지 않아서 늦게 발견된다. 기본값을 넣을 때는 ",[26,2593,155],{},"를 먼저 떠올리고, ",[26,2596,89],{},"는 \"빈 값도 기본값으로 바꾸고 싶다\"는 의도가 분명할 때만 쓰자.",[2599,2600,2601],"style",{},"html pre.shiki code .szBVR, html code.shiki .szBVR{--shiki-default:#D73A49;--shiki-dark:#F97583}html pre.shiki code .sj4cs, html code.shiki .sj4cs{--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .sVt8B, html code.shiki .sVt8B{--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .sZZnC, html code.shiki .sZZnC{--shiki-default:#032F62;--shiki-dark:#9ECBFF}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sJ8bj, html code.shiki .sJ8bj{--shiki-default:#6A737D;--shiki-dark:#6A737D}html pre.shiki code .s9eBZ, html code.shiki .s9eBZ{--shiki-default:#22863A;--shiki-dark:#85E89D}html pre.shiki code .sScJk, html code.shiki .sScJk{--shiki-default:#6F42C1;--shiki-dark:#B392F0}html pre.shiki code .s4XuR, html code.shiki .s4XuR{--shiki-default:#E36209;--shiki-dark:#FFAB70}",{"title":24,"searchDepth":69,"depth":69,"links":2603},[2604,2605,2607,2609,2611,2613,2622],{"id":12,"depth":69,"text":13},{"id":226,"depth":69,"text":2606},"||와 ??의 차이",{"id":1405,"depth":69,"text":2608},"?. 옵셔널 체이닝: 중간에 값이 없어도 터지지 않게",{"id":1646,"depth":69,"text":2610},"??=, ||=, &&=: 값이 없을 때만 채우기",{"id":1818,"depth":69,"text":2612},"기본 매개변수와 구조 분해 기본값은 undefined일 때만",{"id":2113,"depth":69,"text":2114,"children":2614},[2615,2617,2618,2620],{"id":2118,"depth":76,"text":2616},"null과 undefined를 한 번에: == null",{"id":2222,"depth":76,"text":2223},{"id":2312,"depth":76,"text":2619},"??는 NaN을 걸러주지 않는다",{"id":2408,"depth":76,"text":2621},"??와 ||는 괄호 없이 섞을 수 없다",{"id":2467,"depth":69,"text":2468},"볼륨 0이 50으로 바뀌고, 빈 닉네임이 '익명'이 되는 버그는 대부분 || 때문이다. ??와 ||의 차이, ?. 옵셔널 체이닝, ??=, 기본 매개변수가 적용되는 조건, null 검사하는 올바른 방법까지 직접 값을 넣어보며 정리했다.","md",{"date":2626,"field":2627,"tags":2628},"2026.10.08","frontend",[2629],"javascript","\u002Fko\u002Fjavascript-nullish-coalescing-optional-chaining",{"title":5,"description":2623},{"loc":2630},"ko\u002Fjavascript-nullish-coalescing-optional-chaining","Ce7Ka1mA5ysvlGAidm7sNCdQzBmL0-IX_5MTSfvlzQY",[2636,2647,2656,2664,2670,2678,2685,2692,2699,2710,2718,2726,2738,2746,2755,2761,2767,2774,2780,2786,2793,2799,2805,2811,2814,2821,2827,2834,2843,2851,2857,2864,2871,2877,2884,2891,2899,2906,2913,2922,2928,2935,2942,2948,2956,2963,2971,2977],{"path":2637,"title":2638,"description":2639,"meta":2640},"\u002Fko\u002Fadsense-ads-txt-and-seo-indexing-bug","애드센스 ads.txt 경고를 받고 파헤치다가 찾은 진짜 색인 버그","구글 애드센스가 ads.txt 문제를 알려왔는데, 확인해보니 파일은 멀쩡했다. 대신 서치콘솔 색인 수가 적었던 진짜 원인을 Nuxt Content 슬러그 불일치 버그에서 찾은 과정을 정리한다.",{"date":2641,"field":2642,"tags":2643},"2026.09.17","blog",[2644,2645,2646],"seo","adsense","nuxt-content",{"path":2648,"title":2649,"description":2650,"meta":2651},"\u002Fko\u002Fapi-error-response-format","API 에러 응답 형식 설계하기: 제각각인 에러 응답을 RFC 9457 Problem Details로 통일하는 법","어떤 API는 문자열을, 어떤 API는 { error }를, 어떤 API는 { message, code }를 돌려준다면 프론트엔드는 에러마다 다른 코드를 써야 한다. 좋은 에러 응답의 조건과 표준 형식인 RFC 9457 Problem Details, 필드별 검증 에러, 내부 정보 숨기기, Node.js로 한 곳에서 처리하는 방법까지 정리했다.",{"date":2626,"field":2652,"tags":2653},"backend",[2654,2655],"api","http",{"path":2657,"title":2658,"description":2659,"meta":2660},"\u002Fko\u002Fcors-guide","CORS 에러 완전 정리: 왜 막히는지부터 preflight, credentials까지 올바르게 해결하기","'has been blocked by CORS policy' 에러는 서버가 아니라 브라우저가 막은 것이다. 같은 출처 정책, 단순 요청과 preflight, 쿠키를 보내는 요청, 응답 헤더 노출까지 실제 브라우저로 확인한 결과와 함께 정리하고, mode: 'no-cors' 같은 잘못된 해결법도 짚어봤다.",{"date":2626,"field":2652,"tags":2661},[2655,2662,2663],"web-security","nodejs",{"path":2665,"title":2666,"description":2667,"meta":2668},"\u002Fko\u002Fcss-has-selector","CSS :has() 선택자 실전 가이드: 자바스크립트 없이 부모를 선택하는 법","체크하면 카드가 강조되고, 입력이 틀리면 폼 전체가 반응하고, 별점에 마우스를 올리면 앞의 별까지 칠해진다. 예전엔 자바스크립트가 필요했던 일을 CSS :has() 한 줄로 해결하는 실전 예제를 직접 눌러보며 정리했다.",{"date":2626,"field":2627,"tags":2669},[487],{"path":2671,"title":2672,"description":2673,"meta":2674},"\u002Fko\u002Fcss-layouts","CSS Flexbox 완전 정복 가이드","Flexbox를 활용한 반응형 레이아웃 구현 방법과 실전 예제. 수직 정렬, 네비게이션 바, 카드 레이아웃까지 완벽 정리!",{"date":2675,"image":2676,"field":2627,"tags":2677},"2025.01.25","css.jpg",[487],{"path":2679,"title":2680,"description":2681,"meta":2682},"\u002Fko\u002Fcss-login-form","로그인","로그인 UI를 그려보자",{"date":2683,"field":2627,"tags":2684},"2025.03.29",[415,487],{"path":2686,"title":2687,"description":2688,"meta":2689},"\u002Fko\u002Fcsv-parser-cleaning","복잡한 CSV 데이터를 안전하게 파싱하는 방법","JavaScript에서 큰따옴표, 줄바꿈, 쉼표 등 복잡한 CSV 데이터를 안전하게 객체로 변환하는 전체 과정 설명",{"date":2690,"field":2627,"tags":2691},"2025.06.19",[2629],{"path":2693,"title":2694,"description":2695,"meta":2696},"\u002Fko\u002Fdebounce-guide","debounce와 throttle이란??","반복되는 함수 호출을 제어하는 기술인 디바운스(debounce)와 쓰로틀(throttle)을 알아보자.",{"date":2697,"field":2627,"tags":2698},"2025.03.26",[2629],{"path":2700,"title":2701,"description":2702,"meta":2703},"\u002Fko\u002Fdeclarative-vs-procedural-programming","선언적 프로그래밍 vs 절차형 프로그래밍","선언적 프로그래밍과 절차형 프로그래밍은 서로 대비되는 대표적인 패러다임이다. 두 패러다임의 차이를 알아보고, 각 패러다임에 해당하는 언어와 Vue\u002FReact의 특징을 살펴보자.",{"date":2704,"field":2705,"tags":2706},"2025.05.24","concepts",[2707,2708,2709],"paradigm","vue","react",{"path":2711,"title":2712,"description":2713,"meta":2714},"\u002Fko\u002Fdesign-guide","Design-Guide","A comprehensive guide on design principles and best practices for developers.",{"date":2715,"field":2627,"tags":2716},"2025.01.19",[2717],"design-system",{"path":2719,"title":2720,"description":2721,"meta":2722},"\u002Fko\u002Fdikw-pyramid","DIKW 피라미드 정리: 데이터가 지혜가 되기까지","Data, Information, Knowledge, Wisdom 4단계로 구성된 DIKW 피라미드 개념을 로그\u002F분석 데이터 같은 실제 개발 사례에 대입해서 정리한다.",{"date":2723,"field":2705,"tags":2724},"2026.09.18",[2725],"data",{"path":2727,"title":2728,"description":2729,"meta":2730},"\u002Fko\u002Fdisplaying-commits-with-github-actions","깃허브 액션으로 커밋 로그를 블로그에 띄우기: Nuxt와 Vercel 활용법","깃허브 액션을 통해 커밋 데이터를 자동으로 수집하고, Nuxt와 Vercel로 UI에 노출하는 방법을 소개합니다.",{"date":2731,"image":2732,"field":2733,"tags":2734},"2025.02.28","github-commits.jpg","infra",[2735,2736,2737],"github-actions","vercel","nuxt",{"path":2739,"title":2740,"description":2741,"meta":2742},"\u002Fko\u002Fdocker-auto-build-run","로컬에서 커밋 시 도커 빌드 후 컨테이너 시작하기","로컬에서 커밋 시 도커 빌드 후 컨테이너 시작하기.",{"date":2743,"field":2733,"tags":2744},"2025.03.10",[2745],"docker",{"path":2747,"title":2748,"description":2749,"meta":2750},"\u002Fko\u002Fhow-to-mount-storage","라즈베리파이4에 저장장치 마운트 시키기","라즈베리파이에 저장장치를 연결하고 파티션 생성부터 포맷, 마운트까지의 전체 과정을 정리한 기록입니다.",{"date":2751,"field":2733,"tags":2752},"2025.07.11",[2753,2754],"raspberry-pi","linux",{"path":2756,"title":2757,"description":2757,"meta":2758},"\u002Fko\u002Fhtml","HTML이란 무엇인가",{"date":2675,"image":2759,"field":2627,"tags":2760},"html.jpg",[415],{"path":2762,"title":2763,"description":2764,"meta":2765},"\u002Fko\u002Fhtml-features-without-javascript","자바스크립트 없이 HTML만으로 되는 것들: 아직도 div로 다 만들고 있다면","아코디언, 팝오버, 모달, 자동완성, 폼 검증, 이미지 지연 로딩까지. 라이브러리 없이 HTML 태그와 속성만으로 해결되는 기능을 예제와 함께 정리했다. 코드는 줄고 접근성은 덤으로 따라온다.",{"date":2626,"field":2627,"tags":2766},[415],{"path":2768,"title":2769,"description":2770,"meta":2771},"\u002Fko\u002Fhtml2","미치광이 카드 컴포넌트","미치광이 카드 컴포넌트는 어떤 느낌일까",{"date":2772,"field":2627,"tags":2773},"2025.03.28",[415,487],{"path":2775,"title":2776,"description":2777,"meta":2778},"\u002Fko\u002Fhttp-cache-control-guide","HTTP 캐시 제대로 쓰기: Cache-Control, ETag, no-cache와 no-store의 차이","no-cache는 '캐시하지 마라'가 아니다. Cache-Control의 max-age, no-cache, no-store, s-maxage, immutable이 각각 어떻게 동작하는지 실제 브라우저로 서버에 요청이 몇 번 가는지 확인하고, ETag와 304, 배포해도 옛날 파일이 보이는 문제, Vercel CDN 캐시까지 정리했다.",{"date":2626,"field":2652,"tags":2779},[2655,2736],{"path":2781,"title":2782,"description":2783,"meta":2784},"\u002Fko\u002Fhttp-status-codes-guide","HTTP 상태 코드 올바르게 쓰기: 400 vs 422, 401 vs 403, 200 vs 201 vs 204 헷갈릴 때 보는 정리","에러인데 200에 success: false를 담고 있다면, 클라이언트와 모니터링 도구가 실패를 알 수 없다. 상황별로 어떤 상태 코드를 써야 하는지, 401과 403, 400과 422처럼 헷갈리는 코드의 차이, 301과 308처럼 POST가 GET으로 바뀌는 리다이렉트 함정까지 정리했다.",{"date":2626,"field":2652,"tags":2785},[2655,2654],{"path":2787,"title":2788,"description":2788,"meta":2789},"\u002Fko\u002Fhttps-guide","Let's Encrypt를 이용해서 HTTPS 적용하기",{"date":2790,"field":2733,"tags":2791},"2025.03.11",[2792],"https",{"path":2794,"title":2795,"description":2796,"meta":2797},"\u002Fko\u002Fjavascript-async-error-handling","자바스크립트 비동기 에러 올바르게 처리하기: try\u002Fcatch가 못 잡는 경우부터 Promise.all vs allSettled까지","try\u002Fcatch로 감쌌는데 에러가 새어 나가고, 404인데 fetch는 성공했다고 한다. await 빠뜨린 try\u002Fcatch, return vs return await, fetch의 res.ok, Promise.all과 allSettled, 반복문 속 await, 타임아웃과 요청 취소까지 비동기 에러 처리의 함정을 직접 실행해보며 정리했다.",{"date":2626,"field":2627,"tags":2798},[2629],{"path":2800,"title":2801,"description":2802,"meta":2803},"\u002Fko\u002Fjavascript-event-loop","자바스크립트 이벤트 루프 완전 정복: 마이크로태스크와 매크로태스크의 실행 순서","setTimeout(0)보다 Promise.then이 먼저 실행되는 이유는? 콜 스택, 태스크 큐, 마이크로태스크 큐가 어떤 순서로 돌아가는지 예제로 정리하고, 브라우저와 Node.js의 차이, 실무에서 UI 멈춤을 피하는 방법까지 알아보자.",{"date":2626,"field":2705,"tags":2804},[2629,2663],{"path":2806,"title":2807,"description":2808,"meta":2809},"\u002Fko\u002Fjavascript-higher-order-functions","자바스크립트 고차 함수 완전 정복: map, filter, reduce부터 직접 만드는 once, memoize까지","함수를 인자로 받거나 함수를 반환하는 고차 함수. map, filter, reduce를 제대로 쓰는 법부터 once, memoize, pipe, 커링처럼 실무에서 바로 쓰는 고차 함수를 직접 만들어보고, ['1','2','3'].map(parseInt) 같은 함정까지 정리했다.",{"date":2626,"field":2627,"tags":2810},[2629],{"path":2630,"title":5,"description":2623,"meta":2812},{"date":2626,"field":2627,"tags":2813},[2629],{"path":2815,"title":2816,"description":2817,"meta":2818},"\u002Fko\u002Fjs-data-01","JavaScript 데이터01","JavaScript 데이터 다루는 문제를 풀어보자",{"date":2819,"field":2627,"tags":2820},"2025.03.08",[2629],{"path":2822,"title":2823,"description":2824,"meta":2825},"\u002Fko\u002Fjs-data-02","JavaScript 데이터02","복잡한 데이터 구조를 다루는 실전 문제를 해결해보자.",{"date":2819,"field":2627,"tags":2826},[2629],{"path":2828,"title":2829,"description":2830,"meta":2831},"\u002Fko\u002Fjwt-vs-session-auth","JWT vs 세션 인증 비교: 무엇을 써야 할까? 저장 위치, 로그아웃, 보안까지 정리","JWT는 암호화가 아니라 서명이라서 누구나 내용을 읽을 수 있다. 세션과 JWT가 각각 어떻게 동작하는지, 강제 로그아웃이 어려운 이유, localStorage와 httpOnly 쿠키 중 어디에 저장해야 하는지, 리프레시 토큰까지 직접 토큰을 디코딩하고 변조해보며 정리했다.",{"date":2626,"field":2652,"tags":2832},[2833,2662],"auth",{"path":2835,"title":2836,"description":2837,"meta":2838},"\u002Fko\u002Fmarkdown-guid","마크다운 문법","마크다운 문법을 알아보자",{"date":2839,"image":2840,"field":2642,"tags":2841},"2025.03.02","markdown.webp",[2842],"markdown",{"path":2844,"title":2845,"description":2846,"meta":2847},"\u002Fko\u002Fminio-guide","MinIO 완벽 가이드: 설치부터 Node.js 연동까지","MinIO는 오픈소스 기반의 고성능 객체 스토리지 서버입니다. AWS S3와 호환되는 API를 제공하여 클라우드 네이티브 애플리케이션을 위한 완벽한 스토리지 솔루션으로 자리잡고 있습니다.",{"date":2848,"field":2652,"tags":2849},"2025.11.23",[2850,2663],"minio",{"path":2852,"title":2853,"description":2854,"meta":2855},"\u002Fko\u002Fnitro-wildcard-redirect-url-migration","글 주소 프리픽스를 통째로 바꿔야 할 때: Nitro wildcard 리다이렉트로 안전하게 옮기기","\u002Fblog\u002F[슬러그]로 쓰던 글 주소를 \u002Fko\u002F[슬러그]로 옮기면서, 기존 링크\u002F북마크를 하나도 안 깨뜨리고 처리한 방법. Nitro routeRules의 와일드카드 리다이렉트 패턴과 실제로 같이 바꿔야 했던 범위를 정리한다.",{"date":2626,"field":2642,"tags":2856},[2737,2644],{"path":2858,"title":2859,"description":2860,"meta":2861},"\u002Fko\u002Fnode-simple-server","Node.js 간단한 서버 만들기","Node.js로 간단한 HTTP 서버를 만드는 방법",{"date":2862,"field":2652,"tags":2863},"2025.01.30",[2663],{"path":2865,"title":2866,"description":2867,"meta":2868},"\u002Fko\u002Fnodejs-graceful-shutdown","Node.js 서버 안전하게 종료하기 (Graceful Shutdown): 배포할 때마다 요청이 끊기는 이유","배포나 재시작 순간 처리 중이던 요청이 끊긴다면 종료 신호(SIGTERM)를 처리하지 않았기 때문이다. server.close()로 진행 중인 요청을 마치고 끄는 법, keep-alive 연결 때문에 바로 안 꺼지는 함정, Docker와 PM2에서 신호가 전달되지 않는 문제까지 실제로 실행해 확인하며 정리했다.",{"date":2626,"field":2652,"tags":2869},[2663,2745,2870],"pm2",{"path":2872,"title":2873,"description":2874,"meta":2875},"\u002Fko\u002Fnuxt-colormode","Nuxt3 다크모드 적용하기","Nuxt3에 다크모드 적용하여 관리하기",{"date":2683,"field":2627,"tags":2876},[2737],{"path":2878,"title":2879,"description":2880,"meta":2881},"\u002Fko\u002Fnuxt-content-vercel-empty-query-sqlite","배포만 하면 블로그 글이 하나도 안 보이던 버그: Nuxt Content와 Vercel의 \u002Ftmp 문제","로컬에서는 멀쩡한데 Vercel에 올리면 queryCollection()이 빈 배열만 반환하던 버그를 추적한 과정. 원인은 @nuxt\u002Fcontent가 Vercel의 읽기 전용 파일시스템을 지원하기 전 버전에 고정돼 있었던 것.",{"date":2882,"field":2642,"tags":2883},"2026.10.07",[2646,2736],{"path":2885,"title":2886,"description":2887,"meta":2888},"\u002Fko\u002Fnuxt-runtimeconfig-appconfig","Nuxt 설정 runtimeConfig vs app.config 완전 정복","Nuxt3에서 전역 설정을 어떻게 관리하고, 어떤 기준으로 나누어야 할까? 다크모드 예시부터 실무 기준 설정 전략까지 총정리",{"date":2889,"field":2627,"tags":2890},"2025.06.16",[2737],{"path":2892,"title":2893,"description":2894,"meta":2895},"\u002Fko\u002Fnuxt-useasyncdata-cache-error","useAsyncData 캐싱 문제와 Key 동적 설정으로 해결하기","이전 포스트의 데이터가 계속 출력되는 캐싱 관련 문제를 해결하는 방법",{"date":2896,"field":2627,"tags":2897,"image":2898},"2025.01.24",[2737],"cache.jpg",{"path":2900,"title":2901,"description":2902,"meta":2903},"\u002Fko\u002Fnuxt-vercel-sql-error","Nuxt 3에서 Vercel 배포 시 발생한 md 파일 로딩 문제 해결기","Nuxt 3 웹 어플리케이션에서 Vercel 배포 환경에서 발생한 md 파일 로딩 문제를 분석하고 해결한 방법에 대해 공유합니다.",{"date":2896,"image":2904,"field":2627,"tags":2905},"ssg.jpg",[2737,2646,2736],{"path":2907,"title":2908,"description":2909,"meta":2910},"\u002Fko\u002Fnuxt3-pinia-guide","nuxt3 Pinia 적용하기","Nuxt3 프로젝트에서 Pinia를 적용해보자 @pinia\u002Fnuxt",{"date":2683,"field":2627,"tags":2911},[2737,2912],"pinia",{"path":2914,"title":2915,"description":2916,"meta":2917},"\u002Fko\u002Fnuxt3-unit-test","Nuxt 프로젝트에 유닛 테스트 코드 추가하기","Nuxt 3 프로젝트에서 Vitest를 활용한 테스트 환경 설정과 유틸리티 함수 테스트 방법",{"date":2918,"image":2919,"field":2627,"tags":2920},"2025.03.07","unit-test.jpg",[2737,2921],"vitest",{"path":2923,"title":2924,"description":2925,"meta":2926},"\u002Fko\u002Fpm2-guide","프로세스 매니저 PM2","배포환경에서 유용하게 사용할 수 있는 프로세스 매니저를 알아보자.",{"date":2743,"field":2733,"tags":2927},[2870,2663],{"path":2929,"title":2930,"description":2931,"meta":2932},"\u002Fko\u002Freact-createportal","React createPortal 완벽 가이드","React의 `createPortal`을 활용한 UI 구현법, 활용 사례, 장단점 및 코드 예제를 소개합니다.",{"date":2933,"field":2627,"tags":2934},"2025.01.27",[2709],{"path":2936,"title":2937,"description":2938,"meta":2939},"\u002Fko\u002Frouting","Routing","Nuxt file-system routing creates a route for every file in the pages\u002F directory.",{"date":2940,"field":2627,"tags":2941},"2025.01.22",[2737],{"path":2943,"title":2944,"description":2945,"meta":2946},"\u002Fko\u002Fsemantic-html-common-mistakes","의미 있는 HTML 쓰기: 대부분이 하는 시맨틱 HTML 실수 7가지","화면에서는 똑같아 보여도 div로 만든 버튼, label 없는 입력칸, 크기로 고른 제목 태그는 키보드 사용자와 스크린 리더, 검색 엔진에게 전혀 다르게 보인다. 직접 눌러볼 수 있는 예제로 흔한 시맨틱 HTML 실수와 고치는 법을 정리했다.",{"date":2626,"field":2627,"tags":2947},[415],{"path":2949,"title":2950,"description":2951,"meta":2952},"\u002Fko\u002Ftanstack-query-guide","TanStack Query란 무엇인가?","TanStack Query가 웹 애플리케이션에서 데이터 가져오기, 캐싱, 상태 관리를 어떻게 개선하는지 알아본다.",{"date":2953,"field":2627,"tags":2954},"2025.04.15",[2709,2955],"tanstack-query",{"path":2957,"title":2958,"description":2959,"meta":2960},"\u002Fko\u002Fuse-context","리엑트 상태관리 useContext()","React에서 `useContext`를 사용하면 컴포넌트 트리에 깊이 중첩된 컴포넌트에서도 prop drilling 없이 상태를 공유할 수 있습니다. 이 글에서는 `useContext`의 개념, 사용 방법, 장단점, 그리고 실전 예제를 함께 알아보겠습니다.",{"date":2961,"field":2627,"tags":2962},"2025.02.03",[2709],{"path":2964,"title":2965,"description":2966,"meta":2967},"\u002Fko\u002Fvite-plugin-style-inject","리엑티 컴포넌트를 패키지 빌드 시 CSS 같이 적용시키기","dist에 css에 파일이 생성되었으나, 적용 안 되는 이유를 알아보고 에러를 처리하자",{"date":2968,"field":2627,"tags":2969},"2025.04.06",[2970,2709],"vite",{"path":2972,"title":2973,"description":2974,"meta":2975},"\u002Fko\u002Fvue-component-guide","Vue의 \u003Ccomponent :is \u002F> 완벽 정리: 동적 렌더링의 모든 것","Vue에서 \u003Ccomponent :is \u002F>를 활용한 동적 컴포넌트 렌더링 방법과 VNode, 컴포넌트 객체의 차이를 실전 예제로 이해하기",{"date":2675,"field":2627,"tags":2976},[2708],{"path":2978,"title":2979,"description":2980,"meta":2981},"\u002Fko\u002Fvue-query-ref-value-trap-nuxt3","Vue Query에서 데이터가 안 보이는 이유? Nuxt 3와 Ref 구조의 함정","Nuxt 3 + vue-query를 사용할 때 API 데이터가 `v-if` 조건문에서 제대로 표시되지 않는 현상을 해결한 경험을 바탕으로, Ref 구조와 template 디렉티브에서의 차이를 자세히 설명합니다.",{"date":2982,"field":2627,"tags":2983},"2025.06.08",[2737,2708,2955],1791482017108]