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argumentsプロパティの理解と使用例。

argumentsプロパティたるものと、その使用例を、感覚的に理解するためのメモ。
【前提知識】for...of 文

argumentsとは?

  • 実引数のこと。
  • 関数を呼び出す際に入力される引数のこと。
  • 実引数は、関数が持つプロパティのうちのひとつなので、積極的に取得できる。
    • argumentsというプロパティに、配列とおなじ形で代入されている。
    • 例:第一引数 → arguments[0]

【使用例】

使用例.js
const xxx = ()=> {
  for ( let index in xxx.arguments ) {
    console.log ( xxx.arguments[index] );
  }
};
//これで、渡された引数をすべてconsoleに表示することができる。
//map関数の引数バージョンのようなイメージ。

xxx(1,2,3,4,5); 
//1
//2
//3
//4
//5
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