How can I perform `integer division javascript` to get the result as an integer, not a float?

General Discussions
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1

For example, when I do:

var x = 455 / 10;

The result is 45.5, but I want x to be 45 (integer division). Is there a built-in way in JavaScript to perform this kind of operation, or should I manually remove the decimal part?

2

Try using the Math.floor() (Round down) It is the most straightforward and widely used method to get the integer part of the division.

var x = Math.floor(455 / 10);
console.log(x); // Outputs: 45

Math.floor() rounds the result down to the nearest integer, discarding the decimal portion. This is the most common way to perform integer division.

3

In JavaScript, you can use the bitwise OR (|) operator as a quick trick to floor a number to the nearest integer.

var x = (455 / 10) | 0;
console.log(x); // Outputs: 45

The | 0 operation converts the result to a 32-bit integer, effectively discarding the decimal part. This works because JavaScript automatically converts numbers to integers when using bitwise operators.

4

If you want to explicitly cast the result into an integer, you can use parseInt().

var x = parseInt(455 / 10);
console.log(x); // Outputs: 45

parseInt() parses the number and returns the integer part by discarding the decimals. However, it’s less efficient compared to Math.floor() and | 0, and it’s usually better to use one of those methods unless you specifically need to parse the result as a string.