🔰creating arrays

JS ⟩ object ⟩ built-in ⟩ Array ⟩ creating arrays

arrays can be created using：

[1,2,3]          // array literal
[...iterable]    // spread operator

// Array() constructor
new Array()      // === []
new Array(3)     // === [,,,,] (compare with Array.of(3))
new Array(1,2,3) // === [1,2,3]

// Array.of() factory method (⭐️ ES6)
Array.of()       // === []
Array.of(3)      // === [3]
Array.of(1,2,3)  // === [1,2,3]

// Array.from() factory method (⭐️ ES6)
Array.from(iterable)    // === [...iterable]
Array.from(arrayLike)   // array-like -> array
Array.from(iterableOrArrayLike, mapFunc, thisArg)    // general form

🔴 主題

• 🔢array literal

👥 相關

• Array.of() / Array.from() are introduced in ⭐️ ES6 (2015).

📗 參考

• JavaScript: The Definitive Guide > 7.1 Creating Arrays

📘 手冊

• Array.from()