I’m looking to write a function `function range (arr)`

which takes an array, finds the highest and lowest value of that array, subtracts those values and return the total. So for example, the array `[6,2,3,4,9,6,1,0,5])`

would return 8, as 9 is the highest, 1 is the lowest, and then would subtract the two.

Any help would be greatly appreciated.

Cheers