stickermule-test-02.js

function maxDifference(a) {
  let maxDiff = -1;
  let min = a[0];
  
  for (let i = 1; i < a.length; i++) {
    if (a[i] - min > maxDiff) {
      // update diff if greater diff was found
      maxDiff = a[i] - min;
    }
    
    if (a[i] < min) {
      // update min if smaller int was found
      min = a[i];
    }
  }
  
  return maxDiff; 
}