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【ES6】Rest演算子の使い方メモ【JavaScript】

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reduce()メソッドで引数の合計を計算する関数sum()を定義してみる

app.js
function sum( ...theArgs ) {
  return theArgs.reduce((previous, current) => {
    return previous + current
  })
}
console.log(sum(1, 2, 3))

出力結果

6

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