Gone are days the JavaScript round to 2 decimal places functionality plays tough on the code of yours. Read on for grasping more the exact helpful way to make the most out of it!

JavaScript Numbers and Decimal Places

Writing a number without or with decimal places is completely feasible in JavaScript. These are the two primary varieties of numbers in this language. For instance:

let x = 5.15;    // A number with decimals
let y = 5;       // A number without decimals

Decimal places are regularly used in JavaScript, especially when a precise number is required that a whole integer cannot provide.

You can see its high-frequency appearing in relation to things like length, weight and money as examples.

That implies that you will have to prepare the numbers in accordance with a particular format. This may be deceptively challenging.

Let’s say you are working with money, using an integer followed by two decimal places is the transparent approach to prepare money for display.

You can either round a number to move the decimal point (for multiplication) or round a number and move the decimal place back (division).

The question here is: Which approach is correct?

The JavaScript library includes methods to format integers to desired decimal places quickly, making rounding decimals in JavaScript simple and accurate.

JavaScript Round To 2 Decimal Places – How To

Method #1: Using the Number.toFixed() method

An integer is sent into the Number.toFixed() function, which returns the result as a string. The full number will range from 0 to 20.

Running the code:

let x = 3.87612763261;

let res = x.toFixed(2);

console.log(res);

Output:

“3,88”

Method #2: Using the Math.round() Function

To make sure the number is rounded correctly, we take it and add a tiny amount, Number.EPSILON.

After rounding to only the two digits following the decimal point, we multiply the number by 100.

The number is then divided by 100 to a maximum precision of two decimal places.

Running the code:

var numb= 81276325.219843773;

var rounded = Math.round((numb + Number.EPSILON) * 100) / 100;

console.log(rounded);

Output:

81276325.22

Despite being an improvement over.toFixed(), this approach is still not the best option and will incorrectly round to 1.005 as well.

Method #3: Using Double Rounding: The toPrecision() Method

The JavaScript number toPrecision() technique is used in this procedure. This technique formats a number into a length that is given.

Add the decimals to acquire the desired length if they are not given. The advantage of this approach is that it eliminates mistakes that single rounding introduces during intermediate computations.

For Example:

var numObj = 7.12839728;

console.log(numObj.toPrecision());// Returns 7.12839728

console.log(numObj.toPrecision(2));//Returns 7.1

console.log(numObj.toPrecision(3));//Returns 7.13

console.log(numObj.toPrecision(4));//Returns 7.128

Conclusion

JavaScript round to 2 decimal places explanation and how to execute this programming trait have been covered as above. If you have any other concerns, do not hesitate but leave a comment to let us know. See then!