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【初心者】fillメソッドの使い方

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fillメソッドとは

fill()メソッドがわからなかったので使い方の備忘録。

以下のように、new Array(9)とすると、空の値が9つ入った配列が作成される。

  const arr = [1,2,3,4,4,5,6,6,7];
  const a = new Array(9);

それにfill()メソッドで数字を入れることができる。

  a.fill(1);
  console.log(a);//出力結果→ (9) [1, 1, 1, 1, 1, 1, 1, 1, 1]

第一引数に入れたい数字、第二引数に開始位置、第三引数に終了位置をかく更新方法もある。

  a.fill(2, 3, 6);
  console.log(a);//出力結果→ (9) [1, 1, 1, 2, 2, 2, 1, 1, 1]  

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