iterating previous next in a loop

Question

Is there a nice idiomatic way to iterate an array in Coffeescript but accessing both the current and the next item inside the loop? For example in Python you can do:

[f(current, next) for current, next in zip(a, a[1:])]

Answer 1

How about something like this?

array = ['a', 'b', 'c', 'd']

for value, index in array
 current = value
 next = if array[index+1] then array[index+1] else null
 alert "#{current} at #{index} #{next}"