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Repeating the previous one in the cycle

Is there a good idiomatic way to iterate through an array in Coffeescript, but access the current and next element inside the loop? For example, in Python, you can:

[f(current, next) for current, next in zip(a, a[1:])]
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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}"
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I went with this:

(f(a[i], a[i-1]) for i in [1..segment.length-1])


I couldn't think of anything better.

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