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JavaScript Functional Patterns Cheat Sheet

A 2-page reference for functional programming patterns: 15 short entries with copy-ready code.

ForDevelopers

javascript-functional-patterns-cheat-sheet.pdfShowing 16 of 61 lines
// Pure function
const total = (items) => items.reduce((sum, i) => sum + i.price, 0);

// Compose functions
const compose = (...fns) => (x) => fns.reduceRight((v, f) => f(v), x);
const inc = (n) => n + 1;
const dbl = (n) => n * 2;
compose(inc, dbl)(5); // 11

// Pipe functions
const pipe = (...fns) => (x) => fns.reduce((v, f) => f(v), x);
pipe(inc, dbl)(5); // 12

// Currying
const curry = (fn) => function c(...a) {
  return a.length >= fn.length ? fn(...a) : (...b) => c(...a, ...b);

What's inside

Format
PDF, Markdown
Contents
15 sections · 2 pages
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • javascript-functional-patterns-cheat-sheet.pdfPDF · 20 KB
  • javascript-functional-patterns-cheat-sheet.mdMarkdown · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for functional programming patterns. Each of the 15 entries has a one-line explanation and a small example you can paste into your editor. The PDF uses a two-column A4 layout designed to sit next to your keyboard, and the same content ships as Markdown so you can search it or drop it into your notes. Every JavaScript example targets ES2023.

  • JavaScript
  • Pure functions
  • Composition
  • Functional
  • Cheat sheet

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