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Javascriptで1~99までの配列を作る

Last updated at Posted at 2021-02-19

[1,2,3,......,98,99]という配列が必要になったので作ってみる。

方法1 全部書く

app.jp

const numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 62,
63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 
84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99];

とっても素朴。

方法2 ループ処理

(1) whileを用いる

app.jp

const numbers = [];
let number = 1;
while(number < 100) {
    numbers.push(number);
    number += 1;
}

空の配列に1から99まで追加

(2) forを用いる

app.jp
const numbers = [];
for (number = 1; number < 100; number += 1){
  numbers.push(number);
}

同上

方法3 Arrey.fromを用いる

Arrey.from関数なるものがあって、これにより一発でいけるようだが、一見して理解できなかったのでまた学習が進めたあとの宿題としておきます。

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