Function inside if statement?

P T Withington ptw at pobox.com
Wed Feb 6 04:43:18 PST 2008


On 2008-02-05, at 18:53 EST, Brendan Eich wrote:

> SpiderMonkey has for about a decade implemented three kinds of
> function forms: definitions, expressions, and statements. This is an
> example of the last -- it's a function definition, syntactically,
> except produced as a child of another statement, possibly even a
> block -- a position which the ES3 grammar cannot produce a function
> definition. Only if control flow reaches the function statement does
> it bind its name.
>
> This is an extension allowed by ES3 chapter 16.

I would endorse standardizing this behavior.

FWIW, the Openlaszlo compiler/translator extends es3 in a similar  
fashion to support conditional compilation.  An `if` that tests a  
compile-time constant will be optimized away by the compiler.



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