Function indexSignatureGroupByAndMap

indexSignatureGroupByAndMap<T, U>(array, indexExtractor, mapper): {
[index: string]: U[];
}
Apply the given mapping function to every elements and groups all elements of the given array by the key extracted using the given indexExtractor
Type Parameters
- T
- U
Parameters
- array: T[]
  The array to convert.
- indexExtractor: Function1<T, string>
  The extractor function to extract a key from each element.
- mapper: ((element) => U)
  The mapper function.
  - - (element): U
    - Parameters
      element: T
      Returns U
Returns {
[index: string]: U[];
}
an index signature with arrays of converted values grouped by keys.
- [index: string]: U[]
- Defined in src/indexSignatures.ts:246

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