I just spent some time debugging a problem that boiled down to forgetting to use the var keyword in front of a new variable identifier, so Javascript was automatically creating that variable in the global scope. Is there any way to prevent this, or change the default behavior, without using a validator like JSLint?
Running a validator in between writing and executing Javascript code seems like a poor excuse for compiling, which is the step I’d usually rely on to catch this sort of thing.
I’m guessing the answer is a “no,” so I’m looking into a JSLint Eclipse plugin as I post this.
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Answer
ES5 strict mode prevents automatic creation of global variables, but it’s probably going to be a year before there are any shipping browsers that recognise strict mode, so JSLint is probably your best bet until then :-/