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JavaScript Classes and Prototypes Cheat Sheet

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

ForDevelopers

javascript-classes-and-prototypes-cheat-sheet.pdfShowing 22 of 86 lines
// Declare a class
class User {
  constructor(name) {
    this.name = name;
  }
}
const u = new User("Ada");

// Methods and getters
class Rect {
  constructor(w, h) { this.w = w; this.h = h; }
  get area() { return this.w * this.h; }
  scale(k) { return new Rect(this.w * k, this.h * k); }
}

// Class fields
class Counter {
  count = 0;
  inc = () => { this.count++; };
}

// Private fields

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-classes-and-prototypes-cheat-sheet.pdfPDF · 21 KB
  • javascript-classes-and-prototypes-cheat-sheet.mdMarkdown · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for classes and prototypes. 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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