Oddball sum

Write a function called oddball_sum which takes in a list of numbers and returns the sum of all the odd elements. Try to solve with and without reduce function.

To solve this challenge we’ll simply loop through the array while maintaining a final count, and every time an odd number is encountered we’ll add it to the count.

Without reduce:

function oddball_sum(nums) {
 
  // final count of all odd numbers added up
  var final_count = 0;
  
  // loop through entire list
  for (var i = 0; i < nums.length; i++) {
    
    // we divide by 2, and if there is a remainder then
    // the number must be odd so we add it to final_count
    if (nums[i] % 2 === 1) {
      final_count += nums[i]
    }
    
  }
  
  return final_count;
  
}

oddball_sum([1, 2, 3, 4, 5]); 

With reduce:

function oddball_sum(nums) {
  return nums.reduce(function(total, item){
  	if (item % 2 === 1) {
  		return total += item;
  	}
  	return total;
  });
}