Variable select`Const`

select: <T, K>(
    array: readonly T[],
    mapper: (item: T, index: number) => K,
    condition: (item: T, index: number) => boolean,
) => K[]

Select performs a filter and a mapper inside of a reduce, only iterating the list one time.

Type declaration

- <T, K>(
      array: readonly T[],
      mapper: (item: T, index: number) => K,
      condition: (item: T, index: number) => boolean,
  ): K[]
- Type Parameters
  - T
  - K
  Parameters
  - array: readonly T[]
  - mapper: (item: T, index: number) => K
  - condition: (item: T, index: number) => boolean
  Returns K[]

Example

select([1, 2, 3, 4], x => x*x, x > 2) == [9, 16]