unfold

v0.9.6

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PUBLISHED

5 years ago

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Builds a list from a seed value.

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unfold (

fn:Function,

seed:*

) : Array

Builds a list from a seed value. Accepts an iterator function, which returns either false to stop iteration or an array of length 2 containing the value to add to the resulting list and the seed to be used in the next call to the iterator function.

The iterator function receives one argument: (seed).

Example

const f = n => n > 50 ? false : [-n, n + 10];
     R.unfold(f, 10); //=> [-10, -20, -30, -40, -50]

Arguments

fn: Function

The iterator function. receives one argument, seed, and returns either false to quit iteration or an array of length two to proceed. The element at index 0 of this array will be added to the resulting array, and the element at index 1 will be passed to the next call to fn.

seed: *

The seed value.

Returns

Array

The final list.