Finding the sum of an array of numbers in JavaScript
Poor Man
- Published
- Updated
- Reading time
- 1 min read
- Length
- 193 words
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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?
