Both syntaxes use anonymous subs (but they are not really closures in your examples). The first syntax is writing the sub identifier into the symbol table, so that the sub can be called as a normal subroutine (without the -> dereferencing operator), while the second one is using a lexical variable which may have a limited scope and lifespan.

Personally, I would tend to use only the lexical form (with scope) unless I had a good specific reason to do otherwise.

In reply to Re: closures: anonymous subs vs function templates? by Laurent_R
in thread closures: anonymous subs vs function templates? by 5haun

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