map-accum

v0.9.6

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5 years ago

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

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mapAccum (

fn:Function,

acc:*,

list:Array

) : *

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

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) => [a + b, a + b];

     R.mapAccum(appender, 0, digits); //=> ['01234', ['01', '012', '0123', '01234']]

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.