sort() & reverse() in JavaScript
From the JavaScript Array Methods cheat sheet · Array Manipulation · verified Jul 2026
sort() & reverse()
Sort and reverse array elements in place
javascript
// Sort (mutates array!)
arr.sort(); // Alphabetical
arr.sort((a, b) => a - b); // Numeric ascending
arr.sort((a, b) => b - a); // Numeric descending
// Reverse (mutates array!)
arr.reverse();
// Non-mutating versions
const sorted = [...arr].sort();
const reversed = [...arr].reverse();⚠️ Both MUTATE the original array
💡 Use [...arr].sort() to avoid mutation
🔴 sort() converts to strings by default (10 < 2)
📌 Provide compare function for numbers: (a, b) => a - b
⚡ toSorted() and toReversed() are immutable (ES2023)
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