Transducers
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const pipe = (fn,...fns) => (...args) => fns.reduce( (acc, f) => f(acc), fn(...args));
const compose = (...fns) => pipe(...fns.reverse());
const map = f => h => (acc, a) => h(acc, f(a))
const filter = f => h => (acc, a) => f(a) ? h(acc, a) : acc
console.log(
[1,2,3,4,5,6,7,8,9,10]
.reduce(
compose(
map(x => x + 1)
, filter(x => x % 2 == 1)
)((a, b) => a.concat(b))
, [])
);
JavaScript
INFO