JavaScript Math.round( ) function

JavaScript Math.round( ) function is used to round the number passed as a parameter to its nearest integer. 

Syntax:

Math.round(value)

Parameters:

• value: The number to be rounded to its nearest integer.

Example 1: Rounding Off a number to its nearest integer

To round off a number to its nearest integer, the math.round() function should be implemented in the following way: 

Javascript

let round = Math.round(5.8);
console.log("Number after rounding : " + round);

Output:

Number after rounding : 6

Example 2: Rounding Off a negative number to its nearest integer

The Math.round() function itself rounds off a negative number when passed as a parameter to it. To round off a negative number to its nearest integer, the Math.round() function should be implemented in the following way: 

Javascript

let round = Math.round(-5.8);
console.log("Number after rounding : " + round);

Output:

Number after rounding : -6

Example 3: Math.round() function, when a parameter has “.5” as a decimal

Below program shows the result of Math.round() function when the parameter has “.5” as a decimal. 

Javascript

let round = Math.round(-12.5);
console.log("Number after rounding : " + round);
let round2 = Math.round(12.51);
console.log("Number after rounding : " + round2);

Output:

Number after rounding : -12
Number after rounding : 13

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers:

• Chrome 1 and above
• Edge 12 and above
• Firefox 1 and above
• Internet Explorer 3 and above
• Opera 3 and above
• Safari 1 and above

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.