markdown 阵列コンストラクタ

Posted 2021-05-06

let array1 = [];
console.log(array1); // -> []

let array2 = new Array(1, 2);
console.log(array2); // -> [1, 2]

let array3 = new Array(3);
console.log(array3); //-> [undefined, undefined, undefined]
console.log(array3.length); //-> 3

let array4 = new Array(-1, -2);
console.log(array4); // -> [-1, -2]

let array5 = new Array(-3); //-> Uncaught RangeError: Invalid array length

JS-Arrayコンストラクタ
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