I'm converting some js, and have come across numerous examples of this construct: 

if(function(){return a.indexOf(Lb)!=-1 }())return Mb;

[download]
I can convert that to:
if( sub{ return index( $a, $lb ) != -1  }->() ) return $Mb;

[download]

But this achieves the same thing (in Perl):

if( index( $a, $lb ) != -1 ) return $Mb;

[download]

The question(aimed at js progs): Is there anything inherent in the js code that my second Perl versions misses?

Or is this just a case of someone defining an inString() function, that then got inlined, but not unwrapped?

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In reply to OT: Converting some js to Perl by BrowserUk

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