[julia-users] pair-wise operation on an array?

[Evan Pu]

say I want to compute a pair-wise diff for all the elements in the array.
input:        [1, 2, 4, 7, 8]
output:        [1, 2, 3, 1]

is there some kind of "beautiful" way of doing it? i.e. w/o using a for 
loop nor using explicit indecies