\u914d\u5217\u3092\u53d6\u308a\u6271\u3046\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u66f8\u3044\u3066\u3044\u304f\u3068\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u306b\u7279\u5b9a\u306e\u6587\u5b57\u5217\u3084\u6570\u5024\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u78ba\u8a8d\u3057\u305f\u3044\u5834\u9762\u304c\u51fa\u3066\u304d\u307e\u3059\u3002
\n\u305d\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u691c\u7d22\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u3068\u3066\u3082\u7c21\u5358\u306b\u914d\u5217\u306e\u30c7\u30fc\u30bf\u3092\u691c\u7d22\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3001\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n
\u305d\u3053\u3067\u4eca\u56de\u306f\u3001\u691c\u7d22\u306b\u4f7f\u3048\u308bindexOf\u3001find\u3001filter\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u3092\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n
indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u304b\u3089\u691c\u7d22\u3057\u305f\u3044\u6307\u5b9a\u306e\u8981\u7d20\u3092\u63a2\u3057\u3001\u8981\u7d20\u304c\u5b58\u5728\u3059\u308b\u5834\u6240\u3092\u691c\u7d22\u3057\u3066\u304f\u308c\u307e\u3059\u3002
\n\u3053\u306e\u6642\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u5b58\u5728\u3059\u308b\u5834\u6240\u3092\u6559\u3048\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n
const arr = ['Good morning', 'Good afternoon', 'Good evening'];\r\n\r\nconsole.log(arr.indexOf('Good morning')); \/\/ 0\r\nconsole.log(arr.indexOf('Good afternoon')); \/\/ 1\r\nconsole.log(arr.indexOf('Good evening')); \/\/ 2<\/code><\/pre>\n<\/div>\n\u4e0a\u8a18\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u3068\u3001\u305d\u308c\u305e\u308c\u306e\u8981\u7d20\u304c\u4f4d\u7f6e\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u8fd4\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n
\u914d\u5217\u306e\u8981\u7d20\u306e\u6570\u304c\u591a\u3044\u5834\u5408\u3001\u691c\u7d22\u3059\u308b\u7bc4\u56f2\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\nconst arr = [\r\n 'Good morning',\r\n 'Good afternoon',\r\n 'Good evening',\r\n '\u304a\u306f\u3088\u3046',\r\n '\u3053\u3093\u306b\u3061\u306f',\r\n '\u3053\u3093\u3070\u3093\u306f',\r\n 'Good morning',\r\n 'Good afternoon',\r\n 'Good evening'\r\n];\r\n\r\nconst result = arr.indexOf('Good afternoon', 5);\r\n\r\nconsole.log(result); \/\/ 7<\/code><\/pre>\n<\/div>\nindexOf('Good afternoon', 5)<\/code>\u3067\u306f\u3001\u7b2c1\u5f15\u6570\u306b\u691c\u7d22\u3057\u305f\u3044\u6587\u5b57\u5217\u3068\u3001\u7b2c2\u5f15\u6570\u306b\u691c\u7d22\u3092\u958b\u59cb\u3057\u305f\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u30016\u756a\u76ee\u306e\u8981\u7d20\u304b\u3089\u691c\u7d22\u3059\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002<\/p>\n\u305d\u306e\u7d50\u679c\u3001'Good afternoon<\/code>‘\u306f\u914d\u5217\u306e\u4e2d\u306b2\u3064\u5b58\u5728\u3057\u307e\u3059\u304c\u30017\u756a\u76ee\u306b\u3042\u308b\u8981\u7d20\u3060\u3051\u304c\u691c\u7d22\u7bc4\u56f2\u306b\u5f53\u3066\u306f\u307e\u308b\u305f\u3081\u30017<\/code>\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\u6b21\u306b\u3001\u914d\u5217\u306b\u5b58\u5728\u3057\u306a\u3044\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u3068\u3069\u3046\u306a\u308b\u306e\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\nconst arr = [\r\n 'Good morning',\r\n 'Good afternoon',\r\n 'Good evening',\r\n];\r\n\r\nconst result = arr.indexOf('Hello');\r\n\r\nconsole.log(result); \/\/ -1<\/code><\/pre>\n<\/div>\n\u914d\u5217\u306b\u5b58\u5728\u3057\u306a\u3044\u8981\u7d20\u3092\u691c\u7d22\u3059\u308b\u3068\u3001-1<\/code>\u304c\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\nfind\u30e1\u30bd\u30c3\u30c9<\/h2>\n
find\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u3001\u3064\u307e\u308atrue\u3092\u8fd4\u3059\u8981\u7d20\u3092\u914d\u5217\u306e\u5148\u982d\u304b\u3089\u691c\u7d22\u3057\u307e\u3059\u3002
\n\u6761\u4ef6\u306b\u4e00\u81f4\u3057\u305f\u306f\u3058\u3081\u306e\u914d\u5217\u8981\u7d20\u3092\u623b\u308a\u5024\u3068\u3057\u3066\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\nconst arr = [10, 28, 30, 40, 50];\r\n\r\nconst result = arr.find(value => {\r\n return value % 7 === 0;\r\n});\r\n\r\nconsole.log(result); \/\/ 28<\/code><\/pre>\n<\/div>\nvalue % 7 === 0<\/code>\u306f\u30017\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u306e\u8a08\u7b97\u3067\u3059\u3002
\nfind\u30e1\u30bd\u30c3\u30c9\u30677\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u3092\u914d\u5217\u306e\u4e2d\u304b\u3089\u9806\u756a\u306b\u63a2\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u300128<\/code>\u3068\u3044\u3046\u51fa\u529b\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\nfind\u30e1\u30bd\u30c3\u30c9\u306ftrue\u3092\u8fd4\u3059\u3068\u691c\u7d22\u304c\u6b62\u307e\u308a\u3001\u8981\u7d20\u304c\u898b\u3064\u304b\u3089\u306a\u3051\u308c\u3070undefined\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\nconst arr = [10, 28, 30, 40, 50];\r\n\r\nconst devideArr = arr.find(value => value % 10 === 0);\r\nconsole.log(devideArr); \/\/ 10\r\n\r\nconst findArr = arr.find(value => value > 100);\r\nconsole.log(findArr); \/\/ undefined<\/code><\/pre>\n<\/div>\n\u5909\u6570devideArr<\/code>\u3067\u306f\u300110\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u3092\u63a2\u3057\u3066\u3044\u307e\u3059\u3002
\n10\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u304c\u898b\u3064\u304b\u308c\u3070\u305d\u306e\u6642\u70b9\u3067\u691c\u7d22\u3092\u6b62\u3081\u308b\u305f\u3081\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u306f\u3058\u3081\u306e\u8981\u7d2010<\/code>\u306e\u307f\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\u5909\u6570findArr<\/code>\u3067\u306f\u3001100\u3088\u308a\u5927\u304d\u3044\u5024\u3092\u63a2\u3057\u3066\u3044\u307e\u3059\u3002
\n\u914d\u5217\u306b\u306f\u4e00\u81f4\u3059\u308b\u3082\u306e\u304c\u542b\u307e\u308c\u306a\u3044\u305f\u3081\u3001undefined<\/code>\u3068\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\nfilter\u30e1\u30bd\u30c3\u30c9<\/h2>\n
filter\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u3092\u691c\u7d22\u3057\u3001\u4e00\u81f4\u3057\u305f\u3059\u3079\u3066\u306e\u8981\u7d20\u306e\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\nconst arr = [10, 28, 30, 40, 50];\r\n\r\nconst result = arr.filter(value => {\r\n return value % 10 === 0\r\n});\r\n\r\nconsole.log(result); \/\/ [10, 30, 40, 50]<\/code><\/pre>\n<\/div>\n10\u3067\u5272\u308a\u5207\u308c\u308b\u5024\u3092\u3059\u3079\u3066\u691c\u7d22\u3057\u3001\u914d\u5217\u3068\u3057\u3066\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
find\u30e1\u30bd\u30c3\u30c9\u304c\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u306f\u3058\u3081\u306e\u8981\u7d20\u3092\u8fd4\u3059\u306e\u306b\u5bfe\u3057\u3001filter\u30e1\u30bd\u30c3\u30c9\u306f\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u3059\u3079\u3066\u3092\u914d\u5217\u306b\u5165\u308c\u3066\u8fd4\u3059\u3068\u3044\u3046\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
filter\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u8981\u7d20\u304c\u898b\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u3001\u7a7a\u306e\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
\nconst arr = [10, 28, 30, 40, 50];\r\n\r\nconst result = arr.filter(value => value < 10);\r\n\r\nconsole.log(result); \/\/ []<\/code><\/pre>\n<\/div>\n\u307e\u305f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u3092filter\u30e1\u30bd\u30c3\u30c9\u3067\u691c\u7d22\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
\nconst disneyCharacters = [ \r\n {name: 'Mickey Mouse', type: 'mouse'},\r\n {name: 'Cinderella', type: 'princess'},\r\n {name: 'Donald Duck', type: 'duck'},\r\n {name: 'Dumbo', type: 'elephant'},\r\n {name: 'Jasmine', type: 'princess'}\r\n];\r\n\r\nconst findPrincesses = disneyCharacters.filter(princess => {\r\n return princess.type === 'princess';\r\n});\r\n\r\nconsole.log(findPrincesses);\r\n\/\/ [{name: 'Cinderella', type: 'princess'}, {name: 'Jasmine', type: 'princess'}]<\/code><\/pre>\n<\/div>\nfilter\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u7528\u7684\u306a\u4f7f\u7528\u4f8b\u3068\u3057\u3066\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u7ba1\u7406\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u3092\u64cd\u4f5c\u3059\u308b\u5834\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u898b\u8907\u96d1\u305d\u3046\u306b\u3082\u898b\u3048\u307e\u3059\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u914d\u5217\u3092filter\u30e1\u30bd\u30c3\u30c9\u3067\u691c\u7d22\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u30b7\u30f3\u30d7\u30eb\u306a\u69cb\u9020\u3067\u3059\u3002<\/p>\n
\u4e0a\u8a18\u306f\u3001filter\u30e1\u30bd\u30c3\u30c9\u3067'princess'<\/code>\u3068\u3044\u3046type\u306e\u5024\u3092\u6301\u3063\u3066\u3044\u308b\u8981\u7d20\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u305f\u7d50\u679c\u3067\u3059\u3002
\n\u3053\u306e\u3088\u3046\u306b\u3001filter\u30e1\u30bd\u30c3\u30c9\u3092\u6d3b\u7528\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u306e\u4e2d\u304b\u3089\u52b9\u7387\u826f\u304f\u6761\u4ef6\u306b\u5408\u3046\u3082\u306e\u3092\u63a2\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\u307e\u3068\u3081<\/h2>\n
\u4eca\u56de\u306f\u3001\u691c\u7d22\u306b\u5f79\u7acb\u3064\u30e1\u30bd\u30c3\u30c9\u3092\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n
\n\/\/ \u30dd\u30a4\u30f3\u30c8\r\n* indexOf\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6307\u5b9a\u306e\u8981\u7d20\u3092\u691c\u7d22\u3057\u3001\u305d\u306e\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8fd4\u3059\r\n* find\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u306f\u3058\u3081\u306e\u8981\u7d20\u3092\u8fd4\u3059\r\n* filter\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u3059\u3079\u3066\u306e\u8981\u7d20\u3092\u914d\u5217\u3067\u8fd4\u3059<\/code><\/pre>\n<\/div>\n\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3048\u3066\u3001\u5b9f\u8df5\u306e\u5834\u3067\u4f7f\u7528\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u306e\u95a2\u9023\u8a18\u4e8b<\/h2>\n
\u30fb\u914d\u5217\u30e1\u30bd\u30c3\u30c9 -\u8ffd\u52a0\u30fb\u524a\u9664\u30fb\u629c\u304d\u53d6\u308a\u30fb\u5206\u5272\u30fb\u7d50\u5408<\/strong><\/a>
\n\u30fb\u914d\u5217\u30e1\u30bd\u30c3\u30c9 -\u691c\u7d22<\/strong><\/a>\uff08\u5f53\u8a18\u4e8b\uff09
\n\u30fb\u914d\u5217\u30e1\u30bd\u30c3\u30c9 -\u4e26\u3073\u66ff\u3048<\/strong><\/a>
\n\u30fb\u914d\u5217\u30e1\u30bd\u30c3\u30c9 -\u7e70\u308a\u8fd4\u3057<\/strong><\/a>
\n\u30fb\u914d\u5217\u30e1\u30bd\u30c3\u30c9 -\u65b0\u3057\u3044\u914d\u5217<\/strong><\/a>
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