How to sum an array in JavaScript?

The sum() method is a built-in object that you can use to add similar objects together. The syntax required to call the sum method is: sum(element1, element2). You will find it useful when working with arrays or sets. You can get more details on how to use the sum() method in JavaScript in this article. 

array sum javascript

on Jan 01, 1970
const arr = [1, 2, 3, 4];
const sum = arr.reduce((a, b) => a + b, 0);
// sum = 10

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sum of all numbers in an array javascript

on Jan 01, 1970
const arrSum = arr => arr.reduce((a,b) => a + b, 0)

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add all elements in array javascript

on Jan 01, 1970
console.log(
  [1, 2, 3, 4].reduce((a, b) => a + b, 0)
)
console.log(
  [].reduce((a, b) => a + b, 0)
)

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js sum of array

on Jan 01, 1970
[1, 2, 3, 4].reduce((a, b) => a + b, 0)

// Output: 10

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javascript sum of array

on Jan 01, 1970
const sum = arr => arr.reduce((a, b) => a + b, 0);

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javascript sum array values

on Jan 01, 1970
function getArraySum(a){
    var total=0;
    for(var i in a) { 
        total += a[i];
    }
    return total;
}

var payChecks = [123,155,134, 205, 105]; 
var weeklyPay= getArraySum(payChecks); //sums up to 722

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The following code will help you to execute some operations such as summing all elements of an array and finding the sum of two arrays of numbers.

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