Empty for loop - for(;;)

Question

I was exploring the Google Closure Compiler, and one thing I noticed was that it converts while(true) into for(;;).

Both do hang the browse

Answer 1

From the ECMAScript language specification:

IterationStatement : for (ExpressionNoIn_opt ; Expression_opt ; Expression_opt) Statement

If the first Expression is present, then

1. Let testExprRef be the result of evaluating the first Expression.
2. If GetValue(testExprRef) is false, return (normal, V, empty).

Since the first expression (the second argument to for) is not present, this section is never run, so the for loop does not exit.