Duplicate: https://www.codewars.com/kata/max-diff-easy-1

You can always assume there is at least two value in the array, and that all values are integers.

However, the sample tests still cointain this one:

Test.assert_equals(most_difference([3]), 0)

Furthermore, none of the examples show clearly if you want the see the biggest difference between neighbours (that's what all the sample tests suggest); or the biggest difference between any two elements in the array (that's what you expect). See:

[-1, 4, 4, 3, 2] ==> 5
 '----' neighbours

[69, -70, -35, 69] ==> 139
 '------' neighbours

[-98, 81, 0] ==> 179
 '------' neighbours

[948, -479, 708, -156] ==> 1427
 '--------' neighbours

A simple example would make it clear, like:

[2, 4, 4, 3, -1] ==> 5    # not neighbours anymore...