Module "xform/map-keys"

mapKeys

• mapKeys(keys: IObjectOf<Fn2<any, any, any>>, copy?: undefined | false | true): Transducer<any, any>
• mapKeys(keys: IObjectOf<Fn2<any, any, any>>, src: Iterable<any>): IterableIterator<any>
• mapKeys(keys: IObjectOf<Fn2<any, any, any>>, copy: boolean, src: Iterable<any>): IterableIterator<any>

• Takes a keys object of transformation functions and returns a transducer which expects object values. For each input x then calls transformation functions for each key k in keys. I.e. executes keys[k](x[k], x) and reassigns result. By default creates a shallow copy of each x.

  example

  [...mapKeys(
    {
      a: (x) => x != null ? x * 10 : x,
      b: (x) => x != null ? x * 100: "n/a"
    },
    [{a: 1, b: 2}, {c: 3, d: 4}]
  )]
  // [ { a: 10, b: 200 }, { c: 3, d: 4, b: 'n/a', a: undefined } ]

  Parameters

  • keys: IObjectOf<Fn2<any, any, any>>

    object of transformation functions

  • Optional copy: undefined | false | true

    if true (default), creates a shallow copy of each incoming value

  Returns Transducer<any, any>

• Parameters

  • keys: IObjectOf<Fn2<any, any, any>>

  • src: Iterable<any>

  Returns IterableIterator<any>

• Parameters

  • keys: IObjectOf<Fn2<any, any, any>>

  • copy: boolean

  • src: Iterable<any>

  Returns IterableIterator<any>