var numbers = [1, 2, 3, 4, 5];
var sum = 0;

//before reduce
for(var i =0; i<numbers.length; i++){
  sum+=numbers[i];
}

console.log("Before Reduce:-", sum);

//after reduce

var result = numbers.reduce((sum, number) => {
  return sum + number;
}, 0);

console.log('With Reduce:-',result);