reduce

Reduce boils down an array, collection or enumerable object into a single value of type R.

Signature

reduce<T, R>(
    list: TList<T> | undefined,
    fn: (value: R, item: T, ...arguments: any[]) => R,
    initial?: R,
    ...arguments: any[]
): R | undefined

Parameters

Name	Type	Optional	Description
list	T[] | undefined	No	Specifies the array, collection or enumerable object to iterate through.
fn	((...arguments: any[]) => void) | undefined	No	Specifies the reduce function to be invoked for each element. The return value of each reduce function will be the current reduced value.
initial	R	Yes	Optional initial value for the reduce value.
arguments	any[]	Yes	Optional arguments which should be passed to the callee.

Return value

Returns the reduced value.

Example

import { reduce } from "@tripetto/runner";

reduce<number, number>([1, 2, 3], (nValue: number, nItem: number) => nValue + nItem, 2); // Returns `8`