Remove Duplicates From an Array

Problem Remove duplicate values from a JavaScript array; compare multiple implementations and their trade-offs.

Input / Output

• Input: array (primitives; discuss objects separately). Output: new deduped array, order preserved.

Constraints

• Arrays up to 10^6 elements — O(n) approaches matter; O(n^2) ones must be identified as such.

Example

• [1, 2, 2, "2", 3, 1] → [1, 2, "2", 3] (Set uses SameValueZero — types matter).