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JavaScript Proxy, Reflect and Symbols Cheat Sheet

A 2-page reference for Proxy, Reflect and Symbols: 14 short entries with copy-ready code.

ForDevelopers

javascript-proxy-reflect-and-symbols-cheat-sheet.pdfShowing 20 of 80 lines
// Create a Proxy
const p = new Proxy({}, {
  get(target, key) {
    return key in target ? target[key] : `missing:${String(key)}`;
  },
});

// Validate on set
const user = new Proxy({}, {
  set(t, k, v) {
    if (k === "age" && typeof v !== "number") throw new TypeError("age must be a number");
    t[k] = v;
    return true;
  },
});

// Log every access
const spy = (o) => new Proxy(o, {
  get(t, k, r) {
    console.log("get", String(k));

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-proxy-reflect-and-symbols-cheat-sheet.pdfPDF · 21 KB
  • javascript-proxy-reflect-and-symbols-cheat-sheet.mdMarkdown · 2 KB
  • LICENSE.txtadded to every download

About this item

A compact, printable reference for Proxy, Reflect and Symbols. 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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