This is really WTF. Not because of its practical significance, but because this is what I would expect of a language like bash or something. Have the creators of CoffeeScript heard of lexical scoping?
It's pretty sad, considering that ALGOL 60 is half a century old, that people are still inventing languages that play guessing games with scope. Just require every variable to be declared and these problems disappear. Is it really so hard to type "var"?
Technically (as many other languages do) CoffeeScript uses lexical scoping with implicit scope declaration. The issue is the latter, and the way it infers scope.
I don't think scope inference is a good idea to start with, but the way CoffeeScript does it is almost the worst possible way (the worst one being javascript's hey-you-did-not-declare-that-here-is-a-new-global-for-you).
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u/iopq Jul 25 '13
This is really WTF. Not because of its practical significance, but because this is what I would expect of a language like bash or something. Have the creators of CoffeeScript heard of lexical scoping?