Convert the string to a integer in JavaScript

In this tutorial, we are going to learn about how to convert a string to a integer in JavaScript with the help of examples.

Consider, we have a following numeric string:

a = "25";

Now, we need to convert the above string to a integer like this: “25” to 25 .

Using + Plus Operator

To convert a string to a integer, we can use the + operator in JavaScript.

Here is an example:

const a = "25";
const result = +a;

console.log(result);

Output:

25

In the above code, we have added the + plus operator infront of a string. so that it will converts the string to a number.

Using Number() method

Alternatively, we can also use the built-in Number() method in JavaScript to convert a numeric string into a integer.

The Number() method accepts the string as an argument and returns the integer.

Here is an example:

const a = "25";
const result = Number(a);

console.log(result); // 25

Using Number.parseInt() method

The Number.parseInt() takes the two arguments, the first argument is a string and the second argument is the base of a required number that should be converted.

Here is an example:

const a = "25";
const result = Number.parseInt(a, 10);

console.log(result); // 25

In the above code, we have passed the base 10 as a second argument to the Number.parseInt() method.So it parses the string a returns the of base 10.

Note: Base 10 is used for decimal numbers.

Additional resources

You can also checkout similar tutorials by reading the following:

• Convert the String to a float using JavaScript

• Convert the number to a string in JavaScript

• Convert the String to a double using JavaScript