reduce-while

v0.9.6

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Passing

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PUBLISHED

5 years ago

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2 KB

Like [`reduce`](#reduce), `reduceWhile` returns a single item by iterating through the list, successively calling the iterator function.

Collections

Function

Utils

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reduceWhile (

pred:Function,

fn:Function,

a:*,

list:Array

) : *

Like reduce, reduceWhile returns a single item by iterating through the list, successively calling the iterator function. reduceWhile also takes a predicate that is evaluated before each step. If the predicate returns false, it “short-circuits” the iteration and returns the current value of the accumulator.

Example

const isOdd = (acc, x) => x % 2 === 1;
     const xs = [1, 3, 5, 60, 777, 800];
     R.reduceWhile(isOdd, R.add, 0, xs); //=> 9

     const ys = [2, 4, 6]
     R.reduceWhile(isOdd, R.add, 111, ys); //=> 111

Arguments

pred: Function

The predicate. It is passed the accumulator and the current element.

fn: Function

The iterator function. Receives two values, the accumulator and the current element.

a: *

The accumulator value.

list: Array

The list to iterate over.

Returns

*

The final, accumulated value.