sum all the values in an array javascript

1const arrSum = arr => arr.reduce((a,b) => a + b, 0)

1const sum = arr => arr.reduce((a, b) => a + b, 0);

1arr.reduce((a, b) => a + b)

1function getArraySum(a){
2    var total=0;
3    for(var i in a) { 
4        total += a[i];
5    }
6    return total;
7}
8
9var payChecks = [123,155,134, 205, 105]; 
10var weeklyPay= getArraySum(payChecks); //sums up to 722

1array.reduce((a, b) => a + b, 0)

1 function array(arr){
2   var sum = 0;
3   for (var i = 0; i< arr.length; i++){
4    sum += arr[i];
5   }
6   console.log(sum);
7 }
8 array([5, 1, 3, 3])
9