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wdiasvargas/fn_recursive.js

Created February 28, 2019 18:32
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fn_recursive.js
const mapper =(fn, [head, ...tail]) => ( head === undefined && tail.length < 1 ? [] : [fn(head), ...mapper(fn, tail)] );
const filterr = (pred, [head, ...tail]) => head === undefined ? [] : (pred(head) ? [head, ...filterr(pred, tail)] : [...filterr(pred, tail)]);
const reducer = (fn, acc, [head, ...tail]) => head === undefined ? acc : reducer(fn, fn(acc, head), tail);
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