Monotonic Array

Problem

• Difficulty: Blue, Category: Arrays

  Write a function that takes in an array of integers and returns a boolean representing whether the array is monotonic.

  An array is said to be monotonic if its elements, from left to right, are entirely non-increasing or entirely non-decreasing.

  Non-increasing elements aren't necessarily exclusively decreasing; they simply don't increase. Similarly, non-decreasing elements aren't necessarily exclusively increasing; they simply don't decrease.

  Note that empty arrays and arrays of one element are monotonic.

  Sample Input

  array = [-1, -5, -10, -1100, -1100, -1101, -1102, -9001]
  

  Sample Output

  true