JavaScript Type Conversion

JavaScript is a versatile language, and part of its versatility lies in the ability to convert data types. Type conversion is the process of changing a value from one data type to another. JavaScript provides several built-in functions to help you convert data types, and understanding how and when to use them is essential for writing efficient and reliable code.

Why should you use it?

  • Type conversion allows you to use different data types in the same program.
  • It can help you write more efficient code by avoiding unnecessary type conversions.
  • It can help you debug your code by providing more information about the data types being used.

Type Conversion

Type conversion is the process of converting one type of data to another. In JavaScript, there are two main types of data: primitives and objects. Primitives are the basic data types such as numbers, strings, booleans, and null. Objects are complex data structures that contain properties and methods. Type conversion is important to understand because it can help you avoid errors when working with different types of data. For example, when you are trying to add two numbers together, you need to make sure that they are both numbers or else the result will be incorrect. The JavaScript language has built-in methods that can be used to convert between different types of data. These methods are called type conversion functions.

Number()

The Number() function is used to convert a value to a number. It can be used to convert strings, booleans, and null values to numbers.
let num1 = '10';
let num2 = 20;

let result = Number(num1) + num2;
console.log(result);

String()

The String() function is used to convert a value to a string. It can be used to convert numbers, booleans, and null values to strings.
let num1 = 10;
let num2 = 20;

let result = String(num1) + num2;
console.log(result);

Boolean()

The Boolean() function is used to convert a value to a boolean. It can be used to convert numbers, strings, and null values to booleans.
let num1 = 0;
let num2 = 1;

let result = Boolean(num1) || num2;
console.log(result);

Null()

The Null() function is used to convert a value to null. It can be used to convert numbers, strings, and booleans to null.
let num1 = 10;
let num2 = 0;

let result = Null(num1) || num2;
console.log(result);
1