How to Round Numbers to at Most Two Decimal Places in JavaScript?

Rounding to at Most 2 Decimal Places, Only When Necessary

When working with数値, it's often necessary to round them to a specific number of decimal places. In this case, the requirement is to round to at most two decimal places, but only if the number has more than two decimal places after rounding.

Input and Output:
Consider the following input:

10
1.7777777
9.1

The expected output would be:

10
1.78
9.1

JavaScript Solution:
To achieve this in JavaScript, we can utilize the Math.round() method:

Math.round(num * 100) / 100

This expression multiplies the number by 100, rounds the product, and then divides it back to 100. This gives us a number with at most two decimal places.

For numbers like 1.005, which may not round correctly with the above method, we can use Number.EPSILON to ensure accuracy:

Math.round((num + Number.EPSILON) * 100) / 100

This ensures that numbers like 1.005 round to 1.01 instead of 1.00.

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