JavaScript typeof

Introduction

Example

1/* this checks data types */
2typeof "John"; // Returns "string"
3typeof 3.14; // Returns "number"
4typeof true; // Returns "boolean"

Key Points

• `typeof` returns the data type as a lowercase string.
• It identifies strings, numbers, booleans, and objects.
• Arrays return as "object" because they are a special object type.
• Undefined variables return as "undefined".