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UserGalileo/functors_monoid.js

Created April 14, 2020 17:55
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Functors Monoid
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functors_monoid.js
// a -> a (could return whatever)
const f = n => n + 1;
// a -> M a
const g = x => Identity(x);
// Composition gives us Identity(2)
g(1).map(f)
// We could extract the composition here too:
const op = (f1, f2) => compose(map(f2), f1);
// Composition gives us Identity(2)
op(g, f)(1)
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