Adding & Removing Elements in JavaScript
From the JavaScript Array Methods cheat sheet · Array Manipulation · verified Jul 2026
Adding & Removing Elements
Methods to add and remove array elements
javascript
// Add/remove from end
arr.push(4, 5); // Returns new length
arr.pop(); // Returns removed element
// Add/remove from start
arr.unshift(0); // Returns new length
arr.shift(); // Returns removed element
// Add/remove anywhere
arr.splice(1, 2, 'a', 'b'); // At index 1, remove 2, add 'a', 'b'🟢 Essential - Core array operations
⚠️ push/pop/shift/unshift MUTATE the array
💡 push/pop work on end (fast), shift/unshift on start (slower)
⚡ Use spread [...arr, item] for immutable operations
📌 All mutating methods return different values
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