Immutable Variants: toSorted, toReversed, toSpliced, with in JavaScript
From the JavaScript Array Methods cheat sheet · Modern Array Methods (ES2023+) · verified Jul 2026
Immutable Variants: toSorted, toReversed, toSpliced, with
Non-mutating versions of sort/reverse/splice and indexed update
javascript
const nums = [3, 1, 2]
const sorted = nums.toSorted() // [1, 2, 3] — nums untouched
const reversed = nums.toReversed() // [2, 1, 3] — nums untouched
const removed = nums.toSpliced(0, 1) // [1, 2] — nums untouched
const updated = nums.with(0, 99) // [99, 1, 2] — nums untouched
console.log(nums) // [3, 1, 2] — original preserved💡 Same shape as sort/reverse/splice — just prefixed with `to` (and `with` for indexed set)
📌 Always returns a new array — safe for React/Redux state, signals, etc.
⚡ Replaces the [...arr].sort() / structuredClone copy-then-mutate idiom
🎯 `with(-1, x)` is the cleanest way to "replace the last element"
es2023immutablemodern
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