# Sum Of An Array In JavaScript

In this tutorial we learn 2 type of Sum Of An Array In JavaScript

1. Use the `for Loop` to Sum an Array in a JavaScript

2. Use the `reduce()` Method to Sum an Array in a JavaScript # How to Find the Sum of an Array of Numbers in JavaScript

## Ex. 1 - Use the for Loop to Sum an Array in a JavaScript

The for loop is used to sum an array. We can use it to add all the numbers in an array and store it in a variable JavaScript.

```<script>
const array = [1, 2, 3, 4, 5];
let sum = 0;

for (let i = 0; i < array.length; i++) {
sum += array[i];
}
console.log(sum);
</script>```

## Ex. - 2. Use the reduce() Method to Sum an Array in a JavaScript

In this tutorial You can use the `reduce()` method in javascript to find or calculate the sum of an array of numbers.

The `reduce()` method in javascript executes the specified reducer function on each member of the array resulting in a single output value, see example:

```  <script>
var array = [1, 2, 3, 4, 5];

// Getting sum of numbers
var sum = array.reduce(function(a, b){
return a + b;
}, 0);

console.log(sum);
</script>```