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What are the different data types in JavaScript and how to determine the type of a variable?

Revati S Misra15716-Jul-2023

What are the different data types in JavaScript and how to determine the type of a variable?

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Updated on 17-Jul-2023
Revati S Misra

Revati S Misra

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Aryan Kumar

Aryan Kumar

17-Jul-2023

JavaScript has seven primitive data types:

  • String - A sequence of characters.
  • Number - A number, either integer or floating-point.
  • Boolean - A value of true or false.
  • Null - A value that indicates that a variable has no value.
  • Undefined - A value that indicates that a variable has not been assigned a value yet.
  • BigInt - A 64-bit integer.
  • Symbol - A unique identifier.

In addition to these primitive data types, JavaScript also has objects, which are complex data structures that can contain any combination of primitive and object types.

The type of a variable is determined by the value that is assigned to it. For example, if you assign the string "Hello, world!" to a variable, the type of the variable will be "string".

You can use the typeof operator to determine the type of a variable. For example, the following code will print the type of the variable myVar:

const myVar = "Hello, world!";
console.log(typeof myVar); // "string"

The typeof operator can also be used to determine the type of an object. For example, the following code will print the type of the object myObject:

const myObject = {
  name: "John Doe",
  age: 30,
};
console.log(typeof myObject); // "object"

Here is a table that summarizes the different data types in JavaScript and how to determine their type:

Data type Value typeof operator
String A sequence of characters "string"
Number A number, either integer or floating-point "number"
Boolean A value of true or false "boolean"
Null A value that indicates that a variable has no value "null"
Undefined A value that indicates that a variable has not been assigned a value yet "undefined"
BigInt A 64-bit integer "bigint"
Symbol A unique identifier "symbol"
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