Kata

Imagine you start on the 5th floor of a building, then travel down to the 2nd floor, then back up to the 8th floor. You have travelled a total of 3 + 6 = 9 floors of distance.

Given an array representing a series of floors you must reach by elevator, return an integer representing the total distance travelled for visiting each floor in the array in order.

// simple examples
[5,2,8] => 9
[1,2,3] => 2
[7,1,7,1] => 18

// if two consecutive floors are the same,
//distance travelled between them is 0
[3,3] => 0

Array will always contain at least 2 floors. Random tests will contain 2-20 elements in array, and floor values between 0 and 30.