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.
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.