Given an array of non-repeated numbers check whether the numbers are consecutive.

consecutive-array.js

var isConsecutiveArray = function(numbers) {
  var min = numbers[0],
      max = numbers[0]
      n = numbers.length;
      
  for (var i = 1; i < n; i++) {
    if (numbers[i] < min) min = numbers[i];
    if (numbers[i] > max) max = numbers[i];
  }
  
  return (max - min + 1) == n;
};