Function groupBy

groupBy<T, K extends PropertyKey>(
xs: readonly T[],
keyFn: (x: T) => K,
): Record<K, T[]>
Bucket elements into a record keyed by keyFn. Elements sharing a key are appended to the same bucket in input order.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- K extends PropertyKey
Parameters
- xs: readonly T[]
- keyFn: (x: T) => K
Returns Record<K, T[]>
Example
```
pipe(
    orders,
    Arrays.groupBy((o) => o.status),
  )
  // { pending: [...], shipped: [...] }
```
- Defined in arrays/group.ts:14
groupBy<T, K extends PropertyKey>(
keyFn: (x: T) => K,
): (xs: readonly T[]) => Record<K, T[]>
Bucket elements into a record keyed by keyFn. Elements sharing a key are appended to the same bucket in input order.

Dual API — works data-first or curried for use in pipe.
Type Parameters
- T
- K extends PropertyKey
Parameters
- keyFn: (x: T) => K
Returns (xs: readonly T[]) => Record<K, T[]>
Example
```
pipe(
    orders,
    Arrays.groupBy((o) => o.status),
  )
  // { pending: [...], shipped: [...] }
```
- Defined in arrays/group.ts:18