RosettaCodeData/Task/Partial-function-application/JavaScript/partial-function-applicatio...

33 lines
707 B
JavaScript

(() => {
'use strict';
// GENERIC FUNCTIONS ------------------------------------------------------
// curry :: ((a, b) -> c) -> a -> b -> c
const curry = f => a => b => f(a, b);
// map :: (a -> b) -> [a] -> [b]
const map = curry((f, xs) => xs.map(f));
// PARTIAL APPLICATION ----------------------------------------------------
const
f1 = x => x * 2,
f2 = x => x * x,
fs = map,
fsf1 = fs(f1),
fsf2 = fs(f2);
// TEST -------------------------------------------------------------------
return [
fsf1([0, 1, 2, 3]),
fsf2([0, 1, 2, 3]),
fsf1([2, 4, 6, 8]),
fsf2([2, 4, 6, 8])
];
})();