map-accum-right

v0.9.6

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5 years ago

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The `mapAccumRight` function behaves like a combination of map and reduce; it

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mapAccumRight (

fn:Function,

acc:*,

list:Array

) : *

The mapAccumRight function behaves like a combination of map and reduce; it applies a function to each element of a list, passing an accumulating parameter from right to left, and returning a final value of this accumulator together with the new list.

Similar to mapAccum, except moves through the input list from the right to the left.

The iterator function receives two arguments, acc and value, and should return a tuple [acc, value].

Example

const digits = ['1', '2', '3', '4'];
     const appender = (a, b) => [b + a, b + a];

     R.mapAccumRight(appender, 5, digits); //=> ['12345', ['12345', '2345', '345', '45']]

Arguments

fn: Function

The function to be called on every element of the input list.

acc: *

The accumulator value.

list: Array

The list to iterate over.

Returns

*

The final, accumulated value.