Math.round() in JavaScript

Introduction

Math.round() is a built-in method in JavaScript that rounds a number to the nearest integer. The method takes a number as its argument and returns the rounded integer.

Syntax

Math.round(x)

Parameters

• x: A number that needs to be rounded.

Return Value

The Math.round() method returns the rounded integer.

Examples

Here are some examples of using Math.round():

Math.round(2.49) // 2
Math.round(2.51) // 3
Math.round(3.5) // 4
Math.round(3.14159) // 3
Math.round(-2.49) // -2
Math.round(-2.51) // -3
Math.round(-3.5) // -3
Math.round(-3.14159) // -3

Explanation

• In the first example, 2.49 is rounded to 2 because it is closer to 2 than to 3.
• In the second example, 2.51 is rounded to 3 because it is closer to 3 than to 2.
• In the third example, 3.5 is rounded to 4 because it is halfway between 3 and 4, and rounding up is the default behavior.
• In the fourth example, 3.14159 is rounded to 3 because it is closer to 3 than to 4.
• In the fifth example, -2.49 is rounded to -2 because it is closer to -2 than to -3.
• In the sixth example, -2.51 is rounded to -3 because it is closer to -3 than to -2.
• In the seventh example, -3.5 is rounded to -3 because it is halfway between -4 and -3, and rounding up is the default behavior.
• In the eighth example, -3.14159 is rounded to -3 because it is closer to -3 than to -4.

Conclusion

Math.round() is a simple and useful built-in method in JavaScript for rounding numbers to the nearest integer. It is widely used in various programming applications, especially when dealing with data analysis and calculations.