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@nantekkotai

JSのObjectをforEachで処理する方法

More than 5 years have passed since last update.

どうにかforEachで出来ないのかなと思って調べる。

// こういうオブジェクトがあったとしてね
var obj = { tanuki:'pon-poko', kitsune:'kon-kon', neko:'nyan-nyan' };

// forEachで回したいなと

// しかしこれはエラーです
obj.forEach(function (v,i) {
  // 処理...
});

// こうすればOK
Object.keys(obj).forEach(function (key) {
  console.log(key + "" + obj[key] + "と鳴いた!");
});

Object.keysであればプロトタイプチェーンは対象外なので、そのオブジェクトだけが保持しているものだけでループを回せる。

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nantekkotai
意識の低いフロントエンドエンジニア。主にJSを嗜みます。
diggle
予実管理のためのB2B SaaSを提供しています。

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243
Help us understand the problem. What is going on with this article?