ZipArray
Provides an alternative Apply implementation for arrays.
Installation
npm install ziparray
Motivation
The common implementation of Apply for arrays works with all combinations. However, there is another implementation of Apply for arrays that works in "pairwise" fashion. You can think of this as a data type level encoding of the zip family of functions. Encoding the effect ("pairwise" application) in the data type allows us to write code that expresses our intentions better.
Usage
Fantasy Land
> const {ZipArray} = require('ziparray');
undefined
> ZipArray([1,2,3])
ZipArray([1,2,3])
> ZipArray([1,2,3]).map(x => x * 10)
ZipArray([10,20,30])
> ZipArray([x => x + 1, x => x * 3]).ap(ZipArray([1,2,3]))
ZipArray([2,6])
> ZipArray([x => x + 1, x => x * 3]).ap(ZipArray([1,2]))
ZipArray([2,6])
> ZipArray([x => y => x + y, x => y => x * y]).ap(ZipArray([1,20])).ap(ZipArray([3,40]))
ZipArray([4,800])Static Land
> const ZipArray = require('.');
undefined
> const {map, ap} = ZipArray;
undefined
> map(x => x + 10, [1,2,3])
[ 11, 12, 13 ]
> ap([x => x + 1, x => x * 3], [1,2,3])
[ 2, 6 ]
> ap([x => x + 1, x => x * 3], [1,2])
[ 2, 6 ]
> ap(ap([x => y => x + y, x => y => x * y], [1,20]), [3,40])
[ 4, 800 ]
