Compose and pipe functions
Chain single-argument functions left-to-right with pipe, or right-to-left with compose.
- JavaScript
- GreenSnippets
- MIT
- Executed with Node.js 22
const pipe = (...fns) => (input) => fns.reduce((value, fn) => fn(value), input);
const compose = (...fns) => (input) => fns.reduceRight((value, fn) => fn(value), input);Example / expected output
const clean = pipe((s) => s.trim(), (s) => s.toLowerCase());
clean(" HeLLo ") // "hello"How it works
pipe(a, b, c)(x) reads in execution order: c(b(a(x))). compose is the same chain reversed, matching mathematical notation. Each function receives the previous return value.
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