Function uniqueBy

uniqueBy<T, K>(xs: readonly T[], keyFn: (x: T) => K): T[]
Drop duplicates compared by projected key. Keys use Set/SameValueZero semantics. First occurrence per key wins; order preserved.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- K
Parameters
- xs: readonly T[]
- keyFn: (x: T) => K
Returns T[]
Example
```
pipe(
    users,
    Arrays.uniqueBy((u) => u.email),
  )
```
- Defined in arrays/unique.ts:23
uniqueBy<T, K>(keyFn: (x: T) => K): (xs: readonly T[]) => T[]
Drop duplicates compared by projected key. Keys use Set/SameValueZero semantics. First occurrence per key wins; order preserved.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- K
Parameters
- keyFn: (x: T) => K
Returns (xs: readonly T[]) => T[]
Example
```
pipe(
    users,
    Arrays.uniqueBy((u) => u.email),
  )
```
- Defined in arrays/unique.ts:24