Symbol

Lesson in the JavaScript Roadmap · Stage 3: Data Types

Last updated 14 September 2026

What is Symbol?

Symbols are a unique and immutable primitive data type in JavaScript, introduced in ECMAScript 6 (ES6). They are often used to create unique property keys for objects, ensuring no property key collisions occur. Each Symbol value is distinct, even when multiple are created with the same description. Symbols can be created using the Symbol() function, and their primary use case is to add hidden or special properties to objects that won’t interfere with other properties or methods.

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Free resources to learn Symbol

Symbol: common questions

Can I learn Symbol in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Symbol in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Symbol tutorial for beginners?

It is lesson 28 of 124 in the free JavaScript roadmap, in stage 3, Data Types. If you are new to JavaScript, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.