Hoe Hao Cheng hch12907
hch12907
/ map_reduce.js
Created
June 11, 2017 08:10
recursive implementation of map and reduce using only lambdas and Array.prototype.pop()
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| let map = (func, arr) => | |
| arr.length == 0 ? | |
| [] : ((x, y) => [...y, x])(func(arr.pop()), map(func, arr)) | |
| // if you want to pull an one-liner: | |
| // let map = (func, arr) => arr.length == 0 ? [] : ((x, y) => [...y, x])(func(arr.pop()), map(func, arr)) | |
| let reduce = (func, initial_value, arr) => | |
| arr.length == 0 ? | |
| initial_value : ((x, y) => func(y, x))(arr.pop(), reduce(func, initial_value, arr)) |