Simple Fiddle for scoping in coffeescript array loop

It can be difficult to follow variables throughout a for...in...do loop in Coffeescript, so I made this fiddle to test out the shortest syntax to loop and return conditionally only if a criteria is met.

a = [
 "bird",
 "cat",
 "moose"
]

testfunc = (b) ->
 e = ""
 for c in b
 do (c) ->
 if c is "bird"
 e = c
 return e

console.log testfunc(a)

http://jsfiddle.net/Ec245/2/

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