Question

JS:

for(i=this.current.arr.length;i<this.counterLength;i++){
    dosomthing();
    dosomethingelse();
}

COFFEE:

i = @current.arr.length
while i < @counterLength
  dosomthing()
  dosomethingelse()
  i++

I know coffeescript has great loop syntax candy, but I can’t find a more elegant way of writing it than this. Is there a more coffeescripty way of doing this?

I know about:

 for currentArr in current.arr
 //and
 for currentArr, 1 in current.arr

but i needs to start at @currentLength and not 0

Answer 1

The [..] operator is what you are looking for:

start = this.current.arr.length
end = this.counterLength
for [start...end]
    dosomthing()
    dosomethingelse()

No need to predefine start and end, I just used it to make the code a bit clearer. Note that if start is greater then end, then it will go backwards.

Actually you need [...] operator, because you used < instead of <= in the code. The [...] operator excludes the last element.