Data Types in JavaScript

A common warmup question during technical interviews is to name the different data types in JavaScript. Do you know all of them? By data types, we simply mean the type of value in JavaScript. For example, the following data type is a string:

// The type od `data` is a string
const data = 'type';

// We can verify that by using `typeof`
// This will return "string"
typeof data;

We can verify that by using the typeof operator on it. We can separate data types into two different categories:

• Primitives
• Complex

The latest ECMAScript standard defines nine different data types, from which seven are primitives and two are complex. In order theses are:

• String
• Number
• Null
• BigInt
• Boolean
• Undefined
• Symbol

• Object
• Function

50 JavaScript Interview QuestionsAnd their answers explainedHere are 50 JavaScript interview questions that often come up during a technical interview. In one place, one resource to learn from.Learn More

Get access to 300+ webtips 💌

Level up your skills and master the art of frontend development with bite-sized tutorials.

We don't spam. Unsubscribe anytime.

Get Access to Webtips

---

Resources:

• JavaScript data types and data structures