How to sum variables in JavaScript?

In this article, we will discuss how to add variables in JavaScript. But before we dive into that let's talk about what a variable is.

What is a variable in JavaScript? #

A variable in JavaScript is a container that stores data values. Variables are usually declared with the keyword "var". For example, the following code declares a variable called a and assigns it the value of 10.

var a = 10;

Now, you can refer to the value 10 as a throughout your code. Therefore, whenever you need to use the value 10, you can just refer to it as a.

How to sum variables in JavaScript? #

To sum variables in JavaScript, you can use the + operator. Here is an example:

<script>
   var x = 10;
   var y = 15;
   var sum = x + y;
   console.log(sum); // output: 25
</script>

The above code defines two variables, x and y, with the values of 10 and 15 . Then, it adds those two variables together using the + operator and stores the result in a third variable called sum. Finally, it prints the value of the sum variable to the console using the console.log() method.

If you have more than two variables to sum, you can use the same approach, for example :

<script>
   var a = 2;
   var b = 4;
   var c = 6;
   var d = 8;
   var sum = a + b + c + d;
   console.log(sum); // output: 20
</script>

1. Define your variables with values that you want to sum:

   var a = 2;
   var b = 4;
   var c = 6;
   

2. Use the + operator to add the variables together and store the result in a new variable:

   var sum = a + b + c;

3. You can also directly add numeric values together without storing them in variables:

   var sum = 5 + 10 + 15;
   

4. You can also use shorthand to increment a variable by a certain amount:

   var a = 2;
   a += 5; // output 7

5. If your variables contain strings instead of numbers, the + operator will concatenate them instead of adding them together:

   var a = 'Hello ';
   var b = 'world!';
   var sum = a + b  // output : 'Hello world!'

6. When working with decimal values in JavaScript, it's important to keep in mind the limitations of floating-point arithmetic.

   var a = 0.1;
   var b = 0.2;
   var sum = a + b;  // output : 0.3000...