{"id":6839,"date":"2024-12-25T10:46:30","date_gmt":"2024-12-25T01:46:30","guid":{"rendered":"https:\/\/taitan916.info\/blog\/?p=6839"},"modified":"2024-11-05T17:31:05","modified_gmt":"2024-11-05T08:31:05","slug":"post-6839","status":"publish","type":"post","link":"https:\/\/taitan916.info\/blog\/archives\/6839","title":{"rendered":"JavaScript\u3067\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u691c\u7d22\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"

JavaScript\u306b\u3066\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u691c\u7d22\u3059\u308b\u969b\u3001\u4eca\u307e\u3067\u3060\u3068\u30eb\u30fc\u30d7\u3092\u56de\u3057\u3066if\u3067\u4e00\u81f4\u3057\u3066\u3044\u308b\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308b\u3088\u3046\u306a\u5f62\u3092\u53d6\u3063\u3066\u3044\u305f\u3002\u305f\u3060\u3001\u4ed6\u793e\u304c\u4f5c\u6210\u3055\u308c\u305f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u62dd\u898b\u3057\u305f\u969b\u306b\u3082\u3063\u3068\u7c21\u6f54\u306b\u8a18\u8ff0\u3057\u3066\u3044\u308b\u306e\u3092\u898b\u304b\u3051\u305f\u3002\u4ee5\u4e0b\u306b\u4f7f\u3044\u65b9\u53ca\u3073\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u30e1\u30e2\u3002<\/p>\n

 <\/p>\n

1\u4ef6\u306e\u307f\u691c\u7d22\u3059\u308b\u5834\u5408<\/h2>\n

\u914d\u5217<\/h3>\n
const array = [\r\n    { id: 1, name: `\u5c71\u7530`},\r\n    { id: 2, name: `\u9234\u6728` },\r\n    { id: 3, name: `\u4f50\u3005\u6728` },\r\n];\r\nconst result = array.find((elem) => elem.id === 1);\r\nconsole.log(result); \/\/Object { id: 1, name: \"\u5c71\u7530\" }<\/pre>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/h3>\n
Object.entries\u306e\u90e8\u5206\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u914d\u5217\u306b\u5909\u63db\u3057\u3066\u3044\u308b\u3002<\/p>\n
const obj = {\r\n    'apple' : { price: 200, name: `\u308a\u3093\u3054`},\r\n    'orange' : { price: 300, name: `\u30aa\u30ec\u30f3\u30b8`},\r\n    'grapes' : { price: 400, name: `\u3076\u3069\u3046` },\r\n}\r\nconst result = Object.entries(obj).find(([id, elem]) => elem.price === 200);\r\nconsole.log(result); \/\/Array ['apple', { price: 200, name: `\u308a\u3093\u3054`}]<\/pre>\n
\u6ce8\u610f\u70b9<\/h3>\n
find()\u30e1\u30bd\u30c3\u30c9\u306f\u914d\u5217\u5185\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3059\u6700\u521d\u306e\u8981\u7d20\u306e\u307f\u5e30\u3063\u3066\u304f\u308b\u70b9\u306b\u6ce8\u610f\u3002\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u5834\u5408\u306b\u300cid:1, name:\u7530\u4e2d\u300d\u306f\u8fd4\u3063\u3066\u3053\u306a\u3044\u3002<\/p>\n
const array = [\r\n    { id: 1, name: `\u5c71\u7530`},\r\n    { id: 1, name: `\u7530\u4e2d`},\r\n    { id: 2, name: `\u9234\u6728` },\r\n    { id: 3, name: `\u4f50\u3005\u6728` },\r\n];\r\nconst result = array.find((elem) => elem.id === 1);\r\nconsole.log(result); \/\/Object { id: 1, name: \"\u5c71\u7530\" }<\/pre>\n
\u5c1a\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3059\u5024\u304c\u7121\u3044\u5834\u5408\u306f\u300cundefined<\/span><\/span><\/span><\/span>\u300d\u304c\u8fd4\u3063\u3066\u304f\u308b\u3002<\/p>\n
 <\/p>\n
\u8907\u6570\u4ef6\u691c\u7d22\u3059\u308b\u5834\u5408<\/h2>\n
\u914d\u5217<\/h3>\n
const array = [\r\n    { id: 1, name: `\u5c71\u7530`},\r\n    { id: 1, name: `\u7530\u4e2d`},\r\n    { id: 2, name: `\u9234\u6728` },\r\n    { id: 3, name: `\u4f50\u3005\u6728` },\r\n];\r\nconst result = array.filter((elem) => elem.id === 1);\r\nconsole.log(result);\r\n\/*\r\nArray [ {\u2026}, {\u2026} ]\r\n0: Object { id: 1, name: \"\u5c71\u7530\" }\r\n1: Object { id: 1, name: \"\u7530\u4e2d\" }\r\n*\/<\/pre>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/h3>\n
const obj = {\r\n    'apple' : { price: 200, name: `\u308a\u3093\u3054`},\r\n    'lemon' : { price: 200, name: `\u30ec\u30e2\u30f3`},\r\n    'orange' : { price: 300, name: `\u30aa\u30ec\u30f3\u30b8`},\r\n    'grapes' : { price: 400, name: `\u3076\u3069\u3046` },\r\n}\r\nconst result = Object.entries(obj).filter(([id, elem]) => elem.price === 200);\r\nconsole.log(result); \/\/Array ['apple', { price: 200, name: `\u308a\u3093\u3054`}]\r\n\/*\r\nArray [ {\u2026}, {\u2026} ]\r\n0: Array['apple' : { price: 200, name: `\u308a\u3093\u3054`}]\r\n1: Array['lemon' : { price: 200, name: `\u30ec\u30e2\u30f3`}]\r\n*\/<\/pre>\n
 <\/p>\n
\u5b58\u5728\u30c1\u30a7\u30c3\u30af\u306e\u307f\u884c\u3046\u5834\u5408<\/h2>\n
\u914d\u5217<\/h3>\n
const array = [\r\n    { id: 1, name: `\u5c71\u7530`},\r\n    { id: 2, name: `\u9234\u6728` },\r\n    { id: 3, name: `\u4f50\u3005\u6728` },\r\n];\r\nconsole.log(array.some((elem) => elem.id === 1)); \/\/true\r\nconsole.log(array.some((elem) => elem.id === 5)); \/\/false<\/pre>\n
\u4e0a\u8a18\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u5834\u5408\u3001\u914d\u5217\u306e\u4e2d\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5165\u3063\u3066\u3044\u308b\u304c\u3001\u914d\u5217\u306e\u307f\u306e\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u306b\u306a\u308b\u3002<\/p>\n
const array = [1,2,3,4,5];\r\nconsole.log(array.some((elem) => elem === 1)); \/\/true\r\nconsole.log(array.some((elem) => elem === 6)); \/\/false<\/pre>\n
\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/h3>\n
const obj = {\r\n    'apple' : { price: 200, name: `\u308a\u3093\u3054`},\r\n    'orange' : { price: 300, name: `\u30aa\u30ec\u30f3\u30b8`},\r\n    'grapes' : { price: 400, name: `\u3076\u3069\u3046` },\r\n}\r\nconsole.log(Object.entries(obj).some(([id, elem]) => elem.price === 200)); \/\/true\r\nconsole.log(Object.entries(obj).some(([id, elem]) => elem.price === 500)); \/\/false<\/pre>\n
 <\/p>\n
\u30ea\u30d5\u30a1\u30ec\u30f3\u30b9<\/h2>\n
find<\/h3>\n
https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/find<\/a><\/p>\n
filter<\/h3>\n
https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/filter<\/a><\/p>\n
some<\/h3>\n
https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Array\/some<\/a><\/p>\n
Object.entries<\/h3>\n
https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/Object\/entries<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
JavaScript\u306b\u3066\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u691c\u7d22\u3059\u308b\u969b\u3001\u4eca\u307e\u3067\u3060\u3068\u30eb\u30fc\u30d7\u3092\u56de ... <\/p>\n","protected":false},"author":1,"featured_media":1067,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-6839","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/comments?post=6839"}],"version-history":[{"count":3,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6839\/revisions"}],"predecessor-version":[{"id":6842,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/posts\/6839\/revisions\/6842"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media\/1067"}],"wp:attachment":[{"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/media?parent=6839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/categories?post=6839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/taitan916.info\/blog\/wp-json\/wp\/v2\/tags?post=6839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}