Function mapWithIndex

mapWithIndex<T, U>(f): ((x) => U[])
Maps over an array with index.
Type Parameters
- T
- U
Parameters
- f: ((x, i) => U)
  - - (x, i): U
    - Parameters
      x: T
      i: number
      Returns U
Returns ((x) => U[])
- - (x): U[]
  - Parameters
    - x: readonly T[]
    Returns U[]
Example
```
mapWithIndex((x, i) => x + i)(['a', 'b']) // ['a0', 'b1']
```
- Defined in Opt.ts:2398

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