Type Operator in JavaScript

In JavaScript, the type operator (typeof) is a unary operator that returns a string indicating the type of the operand. It is used to check the data type of a value or variable.

Syntax of Type Operator

The syntax of the type operator is as follows:

Type Operator Syntax

let result = typeof operand;

• operand: The value or variable for which the type is to be checked.

Example of Type Operator

The following example demonstrates the usage of the type operator:

Type Operator Example

let num = 10;
let str = "Hello";
let bool = true;
let obj = {};
let arr = [];
let func = function() {};

console.log(typeof num); // Output: number
console.log(typeof str); // Output: string
console.log(typeof bool); // Output: boolean
console.log(typeof obj); // Output: object
console.log(typeof arr); // Output: object
console.log(typeof func); // Output: function

In this example, the type operator is used to check the data type of the values and variables. The typeof operator returns a string indicating the type of the operand.

The typeof operator returns the following values for different data types:

• number for numbers
• string for strings
• boolean for booleans
• object for objects, arrays, and null
• function for functions
• undefined for undefined values
• symbol for symbols
• bigint for big integers
• null for null values

The typeof operator is a useful tool for checking the data type of a value or variable in JavaScript. It is often used in conditional statements and type checking operations.

📝 Note

• The typeof operator is a unary operator that returns a string indicating the type of the operand.
• It is introduced in ECMAScript 1 (1997).
• The typeof operator can be used to check the data type of a value or variable, and it returns a string indicating the type of the operand.
• The typeof operator returns different values for different data types, such as number, string, boolean, object, function, undefined, symbol, bigint, null.
• The typeof operator is often used in conditional statements and type checking operations to determine the data type of a value or variable.

In this guide, you learned about the type operator in JavaScript and how to use it to check the data type of a value or variable. You also saw examples of using the typeof operator to check the data type of numbers, strings, booleans, objects, arrays, and functions. The typeof operator is a useful tool for type checking and conditional statements in JavaScript.

Conclusion

The type operator (typeof) is a unary operator that returns a string indicating the type of the operand. It is used to check the data type of a value or variable. The typeof operator returns different values for different data types, such as number, string, boolean, object, function, undefined, symbol, bigint, null. It is often used in conditional statements and type checking operations to determine the data type of a value or variable. The typeof operator is a useful tool for type checking and conditional statements in JavaScript.