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## Finding the sum of an array of numbers in JavaScript

Beeze Aal

There are few different ways to find the sum of array of numbers in Javascript

### Using for loop

The easiest and fastest option.

var array = [5, 7, 6 ,3 ,2];

var sum = 0;
for(var i=0; i<array.length;i++){
sum+= array[i]
}

console.log(sum);

### Using foreach loop

var array = [5, 7, 6 ,3 ,2];

var sum = 0;
array.forEach(i => sum+=i)
console.log(sum);

### Using map function

var array = [5, 7, 6 ,3 ,2];

var sum = 0;
array.map(i => sum+=i)
console.log(sum);

### Using reduce method

Syntax

array.reduce(function(total, currentValue, currentIndex, arr), initialValue)

Example

var array = [5, 7, 6 ,3 ,2];

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

console.log(sum);

You can also use arrow function to make it look cleaner

var array = [5, 7, 6 ,3 ,2];

var sum = array.reduce((a,b) => a + b, 0);

console.log(sum);

You can find here which method is the fastest for doing this job.