I/O actions in JavaScript

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const monad = require('./monad'); const eff = require('./eff'); function log(x) { return () => console.log(x); } const main = monad.bind(eff, log("Hello"), (_) => log("World")); // DANGER: UNSAFE! main();
function bind(m, x, k) { return m.join(m.map(x, k)); } module.exports = {bind};
function map(x, f) { return () => f(x()); } function pure(x) { return () => x; } function join(x) { return () => x()(); } module.exports = {map, pure, join};
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