how reduce works in js code example
Example 1: 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 2: .reduce mdn
arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])