{"id":10212,"date":"2020-04-26T21:57:08","date_gmt":"2020-04-26T12:57:08","guid":{"rendered":"http:\/\/www.code-magagine.com\/?p=10212"},"modified":"2023-05-27T20:57:42","modified_gmt":"2023-05-27T11:57:42","slug":"%e3%80%90javascript%e3%80%91%e3%80%8c%e9%85%8d%e5%88%97%e3%80%8d%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"http:\/\/www.code-magagine.com\/?p=10212","title":{"rendered":"\u3010JavaScript\u3011\u300c\u914d\u5217\u300d\u3001\u300clodash\u300d\u306e\u6d3b\u7528"},"content":{"rendered":"

\u5206\u5272\u4ee3\u5165<\/h2>\n

\u76f4\u63a5\u914d\u5217\u3067\u4ee3\u5165\u3059\u308b<\/h3>\n

ES6\u304b\u3089\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u4e0b\u8a18\u306e\u3088\u3046\u306b\u914d\u5217\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u3067\u5404\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u4e8b\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n

let array = [1, 2, 3]\r\nlet [a, b, c] = array;\r\na; \/\/1\r\nb; \/\/2\r\nc; \/\/3<\/pre>\n
\u95a2\u6570\u306e\u5f15\u6570\u3067\u914d\u5217\u3092\u6e21\u3057\u3066\u4ee3\u5165\u3059\u308b<\/h3>\n
let _a;\r\nlet _b;\r\n\r\nfunction hairetu([a, b]) {\r\n  _a = a;\r\n  _b = b;\r\n}\r\n\r\nhairetu([2, 3]);\r\n_a; \/\/2\r\n_b; \/\/3<\/pre>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/h3>\n
\u5206\u5272\u4ee3\u5165\u3067\u3082\u901a\u5e38\u306e\u95a2\u6570\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3068\u540c\u69d8\u306b\u8a2d\u5b9a\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
let [a, b = 3] = [2]\r\na; \/\/2\r\nb; \/\/3<\/pre>\n
\u30d3\u30eb\u30c9\u30a4\u30f3\u95a2\u6570<\/h2>\n
filter\u95a2\u6570<\/h3>\n
filter\u95a2\u6570\u3092\u4f7f\u3048\u3070\u914d\u5217\u304b\u3089\u6761\u4ef6\u3092\u6307\u5b9a\u3057\u3066\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u30c7\u30fc\u30bf\u306e\u307f\u62bd\u51fa\u3059\u308b\u4e8b\u304c\u53ef\u80fd<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
let array = [10, 20, 30, 40, 50]\r\nlet resultArray = array.filter(a => {\r\n  return a >= 30;\r\n})\r\nresultArray; \/\/[30,40,50]<\/pre>\n
find\u95a2\u6570<\/h3>\n
\u914d\u5217\u306e\u5148\u982d\u304b\u3089\u30c7\u30fc\u30bf\u3092\u691c\u7d22\u3057\u3066\u6700\u521d\u306b\u4e00\u81f4\u3057\u305f\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
let array = [10, 20, 30, 40, 50]\r\nlet resultArray = array.find(a => {\r\n  return a >= 30;\r\n})\r\nresultArray; \/\/30<\/pre>\n
findIndex\u95a2\u6570<\/h3>\n
\u5024\u3067\u306f\u306a\u304f\u8981\u7d20\u6570\u3092\u8fd4\u3057\u3066\u6b32\u3057\u3044\u5834\u5408<\/strong><\/span>\u306ffindIndex\u95a2\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002\u62bd\u51fa\u3059\u308b\u4ed5\u69d8\u3068\u3057\u3066\u306ffind\u95a2\u6570\u3068\u540c\u69d8<\/strong><\/span>\u3067\u3059\u3002<\/p>\n
let array = [10, 20, 30, 40, 50]\r\nlet resultArray = array.findIndex(a => {\r\n  return a >= 30;\r\n})\r\nresultArray; \/\/2<\/pre>\n
\u914d\u5217\u306e\u6bd4\u8f03\uff08\u30e1\u30e2\u30ea\u306e\u8a71\uff09<\/h2>\n
\u4ee5\u4e0b\u306e\u7b49\u5f0f\u306ftrue\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
2 === 2<\/pre>\n
\u3068\u3053\u308d\u304c\u3001\u4ee5\u4e0b\u306e\u7b49\u5f0f\u306ffalse\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
[1,2,3] === [1,2,3]<\/pre>\n
\u3053\u308c\u306f\u3001\u914d\u5217\u306e\u5834\u5408\u306f\u30e1\u30e2\u30ea\u306e\u756a\u5730\u304c\u7570\u306a\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n
\u306a\u305c\u914d\u5217\u306f\u3053\u306e\u3088\u3046\u306a\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304b\uff1f<\/h3>\n
\u30c7\u30fc\u30bf\u306e\u4e2d\u8eab\u3092\u66f8\u304d\u63db\u3048\u308b\u305f\u3081\u306b\u4ed6\u306a\u3089\u306a\u3044\u3067\u3059\u3002\u901a\u5e38\u306e\u6570\u5024\u3084\u6587\u5b57\u306a\u3069\u306e\u5024\u306e\u5834\u5408\u306f\u7279\u306b\u5024\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u3066\u3044\u306a\u3044\u4e0d\u5909\u30c7\u30fc\u30bf\u3068\u3057\u3066\u4f7f\u3046\u3053\u3068\u3092\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u914d\u5217\u306e\u5834\u5408\u306f\u5024\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
lodash\u306e\u6d3b\u7528<\/h2>\n
\u4f8b\u3048\u3070API\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u4e0b\u8a18\u306e\u3088\u3046\u306a\u914d\u5217\u304c\u3042\u3063\u305f\u3068\u3057\u307e\u3059\u3002\u305f\u3060\u3001\u3053\u306e\u5f62\u5f0f\u3060\u3068id\u304c2\u306e\u30c7\u30fc\u30bf\u304c\u6b32\u3057\u3044\u3068\u306a\u3063\u305f\u3068\u304d\u306b\u914d\u5217\u3092\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n
[\r\n{id:1,name:\"test1\"},\r\n{id:2,name:\"test2\"}\r\n]<\/pre>\n
lodash\u3068\u3044\u3046\u30d1\u30c3\u30b1\u30fc\u30b8\u3092\u4f7f\u7528\u3059\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306a\u30cf\u30c3\u30b7\u30e5\u5f62\u5f0f\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n
{\r\n1:{id:1,name:\"test1\"},\r\n2:{id:2,name:\"test2\"}\r\n}<\/pre>\n
\u3053\u308c\u306a\u3089\u6b32\u3057\u3044ID\u306e\u30c7\u30fc\u30bf\u306b\u76f4\u30a2\u30af\u30bb\u30b9\u304c\u3067\u304d\u308b\u306e\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u3088\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u4f7f\u3044\u65b9<\/h3>\n
\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n
import _ from 'lodash'<\/pre>\n
\u5b9f\u88c5<\/h4>\n
\u4e0b\u8a18\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308c\u3070\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
_.mapKeys(\u30cf\u30c3\u30b7\u30e5\u306e\u914d\u5217,'\u76ee\u5370\u3068\u3057\u305f\u3044\u30cf\u30c3\u30b7\u30e5\u306e\u30ad\u30fc')<\/pre>\n
\u7528\u9014<\/h3>\n
Vue.js\u3084React\u306a\u3069\u306eJavaScript\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067API\u547c\u3073\u51fa\u3057\u3092\u884c\u3063\u305f\u969b\u306blodash\u3092\u4f7f\u7528\u3057\u3066\u52a0\u5de5\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5206\u5272\u4ee3\u5165 \u76f4\u63a5\u914d\u5217\u3067\u4ee3\u5165\u3059\u308b ES6\u304b\u3089\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\u4e0b\u8a18\u306e\u3088\u3046\u306b\u914d\u5217\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u3067\u5404\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u4e8b\u304c\u53ef\u80fd\u3067\u3059\u3002 let array = [1, 2, 3] let [a, b, c] = array; a; \/\/ […]","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"_links":{"self":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10212"}],"collection":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10212"}],"version-history":[{"count":13,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10212\/revisions"}],"predecessor-version":[{"id":20288,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=\/wp\/v2\/posts\/10212\/revisions\/20288"}],"wp:attachment":[{"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10212"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10212"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.code-magagine.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}