Type Alias ArrReduceCallbackFn<T, R>

ArrReduceCallbackFn<T, R>: ((previousValue: T | R, currentValue: T, currentIndex: number, array: T[]) => R)

The reducer function called for arrReduce.

Type Parameters

T
Identifies the type of array elements
R = T
Identifies the type of the return array elements (defaults to T)

Type declaration

- (previousValue, currentValue, currentIndex, array): R
- Parameters
  - previousValue: T | R
    The value resulting from the previous call to callbackFn. On first call, initialValue if specified, otherwise the value of array[0].
  - currentValue: T
    The value of the current element. On first call, the value of array[0] if an initialValue was specified, otherwise the value of array[1].
  - currentIndex: number
    The index position of currentValue in the array. On first call, 0 if initialValue was specified, otherwise 1.
  - array: T[]
    The array being traversed.
  Returns R