max-diff.js

function maxDiff(list) {
  
  // If we get an empty list, just return 0
  if (list.length === 0) {
    return 0;
  }
  
  // Initialize biggest and smallest nums to the first item in the list
  let biggestNum = list[0];
  let smallestNum = list[0];
  
  // Find the biggest and smallest numbers in the list
  for (const number of list) {
    if (number < smallestNum) {
      smallestNum = number;
    }
    if (number > biggestNum) {
      biggestNum = number;
    }
  }
  
  // Return their difference
  return biggestNum - smallestNum;  
};