Published on December 15, 2020
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By Ceferino IV Villareal




var numbers = [1, 3, 6, 8, 11];

var lucky = numbers.filter(function(number) {
  return number > 7;

// [ 8, 11 ]



var newArray = array.filter(function(item) {
  return condition;

item 引数は、配列内の現在の要素を参照し、filter() はこの要素とconditionを比較してチェックします。これは、オブジェクトの場合にプロパティにアクセスするのに役立ちます。

現在のitem が条件を満たすと、新しい配列に送信されます。


.filter() の一般的な使用例として、プロパティを使用するオブジェクトの配列があります。

var heroes = [
    {name: “Batman”, franchise:DC},
    {name: “Ironman”, franchise: “Marvel”},
    {name: “Thor”, franchise: “Marvel”},
    {name: “Superman”, franchise:DC}

var marvelHeroes =  heroes.filter(function(hero) {
    return hero.franchise == “Marvel”;

// [ {name: “Ironman”, franchise: “Marvel”}, {name: “Thor”, franchise: “Marvel”} ]


filter() の詳細については、MDNリファレンスを参照してください。

Filterは、JavaScriptでの配列のいくつかの反復メソッドの1つにすぎません。JavaScriptのArray反復メソッドの使用方法を読んで、map() および reduce()などの他のメソッドについて学ぶことができます。

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About the authors
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Ceferino IV Villareal


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