The compose
function in the code below takes any number of functions, returns a function that takes the initial value, and then uses the reduceRight
function to iterate right-to-left over each function f
in functions
argument and returns the accumulated value y
. In other words, the compose
function creates a pipeline of functions with the output of the function is connected to the input of the next function.
const compose = (...functions) => (x) =>
functions.reduceRight((y, f) => f(y), x);
const g = (n) => n + 1;
const f = (n) => n * 2;
const h = compose(f, g);
h(20); // => 42
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