# JavaScript program to find out the largest of three numbers

## Introduction :

We can use different ways to find the largest among the three numbers in JavaScript. We can either use extra variables to find the largest or we can directly find without using any extra variables. In this blog post, I will show you different ways to find out the largest of three numbers in JavaScript. Try to go through the programs and drop one comment below if you have any queries.

## Example: Using extra variables :

The simplest way to find the largest of three variables is by using extra variables. Let’s take a look at the below example :

let firstNo = 1110; let secondNo = 9120; let thirdNo = 344; let largerNo = firstNo > secondNo ? firstNo : secondNo; let largestNo = largerNo > thirdNo ? largerNo : thirdNo; console.log(`Largest number ${largestNo}`);

Here, we are using two extra variables: *largerNo* and *largestNo*. The *largerNo* variable stores larger number among *firstNo* and *secondNo*. And, the *largestNo* variable stores the larger number among *largerNo* and *largestNo* i.e. it will contain the largest number among all.

## Example 2: Using if-else :

We can find out the largest of three numbers using multiple *if-else* conditions like below :

let firstNo = 1110; let secondNo = 120; let thirdNo = 3044; if (firstNo > secondNo) { if (firstNo > thirdNo) { console.log(`${firstNo} is the largest number`); } else { console.log(`${thirdNo} is the largest number`); } } else { if (secondNo > thirdNo) { console.log(`${secondNo} is the largest number`); } else { console.log(`${thirdNo} is the largest number`); } }

If the *firstNo* is greater than *secondNo*, check if *firstNo* is greater than *thirdNo* or not. Else, i.e. if *firstNo* is less than *thirdNo*, check if *secondNo* is greater than *thirdNo* or not. That’s it.

The main advantage of this program is that we are not using any extra variables to find out the largest.

## Using Math.max() :

JavaScript *Math.max()* function is used to find out the larger value of two numbers. We can also use this method to find out the largest among the three numbers.

The below JavaScript program uses *Math.max()* to find the largest among three numbers *firstNo*, *secondNo* and *thirdNo*. The inner *Math.max* function will find the larger number between *firstNo* and *secondNo*. The outer *Math.max* function will find the larger number between this result number and the *thirdNo*. So, it will give us the largest of these three numbers.

let firstNo = 10; let secondNo = 20; let thirdNo = 344; let largestNo = Math.max(Math.max(firstNo,secondNo),thirdNo) console.log(`Largest number ${largestNo}`);

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