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変数・クラスの初期化前の参照(JavaScript)

Last updated at Posted at 2024-11-05

こんにちは。
JavaScript では変数・クラスの初期化前の参照は許されません。

下記を実行させると、エラーとみなされます(Cannot access ... before initialization)。ただし bun run ./color.js ではエラーは生じません。

なお、function 文は後置記述が許されます。

color.js
const color = generate_color();
console.log(color);

class Color{
  constructor() {
    this.R = getRandomInt(255);
    this.G = getRandomInt(255);
    this.B = getRandomInt(255);
  }
}

function generate_color() {
  return new Color();
}

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}
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