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JavaScriptで配列に特定の要素が含まれているか判定する

Last updated at Posted at 2019-04-30

Array​.prototype​.includes()を使えば
探している要素が含まれていればtrue, 含まれていなければfalseを返してくれます。

const array = [1, 2, 3, 4, 5];

const result1 = array.includes(3); //true
const result2 = array.includes(6); //false

ES2016で実装された模様。

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