Strictly Increasing or Decreasing

Published by Helen Yu in
arraysconditionscontrol_flowloops

Create a function that takes an array and determines whether it's strictly increasing, strictly decreasing, or neither.

Examples

check([1, 2, 3]) ➞ "increasing"

check([3, 2, 1]) ➞ "decreasing"

check([1, 2, 1]) ➞ "neither"

check([1, 1, 2]) ➞ "neither"

Notes

  • The last example does NOT count as strictly increasing, since 1-indexed 1 is not strictly greater than the 0-indexed 1.
  • Input arrays have a minimum length of 2.
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