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株式会社ビットエーAdvent Calendar 2017

JavaScriptで、変数の値がどれかに一致すればtrueになる式の書き方

JavaScript

Last updated at 2017-12-04Posted at 2017-12-04

`===`と`||`を使ったオーソドックスな書き方

const x = 'banana';
console.log(x === 'apple' || x === 'banana' || x === 'orange'); // => true

ES2016の`Array.prototype.includes()`を使った書き方

const x = 'banana';
console.log(['apple', 'banana', 'orange'].includes(x)); // => true

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