Creating Arrays

Arrays in JavaScript are used to store ordered collections of values. They can be created using array literals, the Array constructor, or static methods like Array.from() and Array.of().

Key Points

• Array literals: [] with comma‑separated values.
• Array constructor: new Array(length) or new Array(elements).
• Array.of(): creates an array from arguments, avoiding the single‑number special case.
• Array.from(): creates an array from array‑like or iterable objects.

Code Example

// Array literal
const fruits = ["apple", "banana", "cherry"];

// Array constructor
const numbers = new Array(5); // empty array with length 5
const colors = new Array("red", "blue"); // ["red", "blue"]

// Array.of() – avoids single‑number trap
const arr1 = Array.of(7); // [7]
const arr2 = Array.of(1, 2, 3); // [1, 2, 3]

// Array.from() – from string or array-like
const chars = Array.from("hello"); // ["h", "e", "l", "l", "o"]
const fromSet = Array.from(new Set([1, 2, 3])); // [1, 2, 3]