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JavaScript Closures and Scope Cheat Sheet

A 2-page reference for closures and scope: 14 short entries with copy-ready code.

ForDevelopers

javascript-closures-and-scope-cheat-sheet.pdfShowing 24 of 93 lines
// let and const are block scoped
if (true) {
  const inside = 1;
}
// inside is not defined here

// var is function scoped
function f() {
  if (true) {
    var x = 1;
  }
  return x; // 1
}

// A closure remembers its scope
function counter() {
  let n = 0;
  return () => ++n;
}
const next = counter();
next(); // 1
next(); // 2

// Private state with closures

What's inside

Format
PDF, Markdown
Contents
14 sections · 2 pages
Version
1.0 · Updated 3 Oct 2026
Licence
Commercial What this means
Checked
Checked before it ships
  • javascript-closures-and-scope-cheat-sheet.pdfPDF · 21 KB
  • javascript-closures-and-scope-cheat-sheet.mdMarkdown · 3 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for closures and scope. Each of the 14 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.

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