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Possible Duplicate:
Empty for loop – for(;;)
I just found a strange construct in the JS parser of UglifyJS (at L1045): for(;;){…}.
I assumed that an empty condition would resolve to undefined, which is converted to the boolean value false. But that’s definitely not the case.
Apparently, it triggers an infinite loop. I was able to reproduce this behavior, but I have no clue why. Any (logical) explanations?
Besides: When this is possible, why doesn’t while(){…} work?
That’s just the definition of the semantics. A missing “test” expression is treated as an expression with the value
true. Languages are made up by people, and they are at liberty to specify any behavior they like. Clearly, that behavior is something Mr. Eich likes 🙂