Function groupBy

groupBy<T, K>(sourceArray: T[], extractKeyFn: (item: T) => K): Map<K, T[]>
Splits the array into subgroups

It is O(n) in complexity.
Type Parameters
- T
  Type of the items in the array
- K
  Type of the key, it must be a base type.
Parameters
- sourceArray: T[]
  Array to split
- extractKeyFn: (item: T) => K
  The function that gives the key of the group of an item
Returns Map<K, T[]>
A map of the items grouped by their extracted key.
- Defined in packages/firestorm/src/core/array.ts:35