Data types and the typeof operator

In ECMAScript there are five simple data types (also called primitive types) and one complex datatype.

The simple data types are:

• Undefined;
• Null;
• Boolean;
• Number;
• String.

The complex data type is:

• Object.

To determine the data type of a variable, the typeof operator may be used.

This is the list of possible returned values:

• undefined;
• boolean;
• string;
• number;
• object;
• function.

Although functions are considered to be objects due some differences in their properties the typeof operator distinguishes between them.

Example

The typeof operator example:

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