GitHub 6248★

Compose functions from left to right

JavaScript version

// Compose functions from left to right
const pipe =
(...fns) =>
(x) =>
fns.reduce((y, f) => f(y), x);

Examples

const lowercase = (str) => str.toLowerCase();
const capitalize = (str) => `${str.charAt(0).toUpperCase()}${str.slice(1)}`;
const reverse = (str) => str.split('').reverse().join('');

const fn = pipe(lowercase, capitalize, reverse);

// We will execute `lowercase`, `capitalize` and `reverse` in order
fn('Hello World') === 'dlrow olleH';
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