how to add all values in an array javascript code example

Example 1: javascript sum of array

const sum = arr => arr.reduce((a, b) => a + b, 0);

Example 2: add all elements in array javascript

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

Example 3: javascript sum array values

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

Example 4: sum all the values in an array javascript

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

Example 5: sum of all elements in array javascript

arrSum = function(arr){  return arr.reduce(function(a,b){    return a + b  }, 0);}