Stop writing for loops

var numbers = [1,9,9,2];
for(var i = 0; i < numbers.length; i++) {
  console.log(numbers[i]);
}
// is equivalent to 
numbers.forEach(function(value, index, array) {
  /*via this callback function
    you still have access to the whole array
    and the index of the current value.*/
  console.log(value);
});