How can I convert a JavaScript for-loop to CoffeeScript?
for (i = 0; i < 10; i++) {
doStuff();
}
That's the JavaScript code that I Want to convert to CoffeeScript.
doStuff() for i in [0 .. 9]
This is explained on the introduction page: http://coffeescript.org/#loops
Edit/Update by JP:
The exact translation is:
doStuff() for i in [0...10]
You need to be careful with the ".." vs "...", for example:
count = 0
doStuff() for i in [0..count] #still executes once!
So you think, no problem... I'll just loop until count-1!
count = 0
doStuff() for i in [0..count-1] #executes twice!! '0' and then '-1'
Literal translation of:
for (var i = 0; i < someCount; ++i)
doStuff()
is
for i in [0...someCount]
doStuff()
The marked answer is functionaly correct but the generated code doesn't match the original javascript.
The right way (read, the one closest to the following javascript)
for (i = 0; i < 10; i++) {
doStuff();
}
is doStuff() for i in [0..someCount] by 1
Note the by 1 on the for loop.
Now this code, still creates an extra _i
variable. If you can't live with it, then use the following:
i=0
while i<=someCount
doStuff()
i++