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Javascript

Last updated at Posted at 2023-01-16
// returnがなくても返るケース
const hoge = () => ({a:1, b:2});

// returnが必要なケース
const fuga = () => {
  const obj = {a:1, b:2};
  return obj;
}

この違いは、式の返り値がどうなっているかの違いです!
iTerm上だと、

> {a:1, b:2}
{a:1, b:2}
> const obj = {a:1, b:2}
undefined

こんな感じになると思うのですが、変数定義の返り値はundefinedなので2文以上の場合は基本returnが必要になる。

参考:https://iwb.jp/javascript-arrow-function-omits-return-tips/

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