🔸array length

JS ⟩ object ⟩ built-in ⟩ Array ⟩ length

• array length is automatically maintained by the array.

• if you assign a[i] = value, where i ≥ a.length, a.length is set to i+1.

• if you set a.length = n, where n < a.length, then any elements whose index ≥ n are deleted.

📗 參考

• JavaScript: The Definitive Guide > 7.4 Array Length