Finding the sum of an array of numbers in JavaScript

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

Using for loop

The easiest and fastest option.

        
javascript
        

            
        
     
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

        
javascript
        

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

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

Using map function

        
javascript
        

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

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

Using reduce method

Syntax

        
javascript
        

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

Example

        
javascript
        

            
        
     
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

        
javascript
        

            
        
     
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.

JS reduce vs map vs foreach vs for loop

Which is the fastest method among reduce vs map vs foreach vs for loop?

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