sum array with reduce code example

Example 1: javascript reduce sum

let nums = [1, 2, 3];

nums.reduce((curr, next) => curr + next);

Example 2: 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