js-tosorted-immutable

.sort() mutates the array in place, which can cause bugs with React state and props. Use .toSorted() to create a new sorted array without mutation.

Skills
Web development
1

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Content

---
title: Use toSorted() Instead of sort() for Immutability
impact: MEDIUM
impactDescription: prevents mutation bugs in React state
tags: javascript, arrays, immutability, react, state, mutation
---

## Use toSorted() Instead of sort() for Immutability

`.sort()` mutates the array in place, which can cause bugs with React state and props. Use `.toSorted()` to create a new sorted array without mutation.

**Incorrect (mutates original array):**

```typescript
function UserList({ users }: { users: User[] }) {
  // Mutates the users prop array!
  const sorted = useMemo(
    () => users.sort((a, b

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