JS Arrays

Array Basics

Arrays store ordered collections of values: const arr = [1, 2, 3];.

Array Methods

• push(), pop()
• shift(), unshift()
• splice(), slice()
• map(), filter(), reduce()

Examples

let nums = [1, 2, 3];
nums.push(4);
nums = nums.map(n => n * 2);
const evens = nums.filter(n => n % 2 === 0);
const sum = nums.reduce((a, b) => a + b, 0);