filter() - Select Elements in JavaScript
From the JavaScript Array Methods cheat sheet · Transformation Methods · verified Jul 2026
filter() - Select Elements
Create a new array with elements that pass a test
javascript
// Keep elements that pass the test
const evens = [1, 2, 3, 4].filter(x => x % 2 === 0);
// [2, 4]
const adults = users.filter(u => u.age >= 18);
// Remove falsy values
const truthy = [0, 1, '', 'hello', null].filter(Boolean);
// [1, 'hello']🟢 Essential - Use for selecting subset of elements
💡 Returns new array with filtered items
⚡ Chainable with other array methods
📌 Original array remains unchanged
⚠️ Returns empty array if nothing matches