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Re: Autovivification in perl

by ikegami (Pope)
on Jan 10, 2014 at 20:24 UTC ( #1070186=note: print w/replies, xml ) Need Help??

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  1. or download this
    $quick[0][3]
    
    $ref->{Oxford}{Ram}{Population}
    
    $hash{ram}{mohan}{perl}{linux}
    
  2. or download this
    ( $quick[0] //= [] )->[3]
    
    ((( $ref //= {} )->{Oxford} //= {} )->{Ram} //= {} )->{Population}
    
    ((( $hash{ram} //= {} )->{mohan} //= {} )->{perl} //= {} )->{linux}
    

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[Eily]: It can also be used to force a copy, and remove magic from a variable
[Eily]: there was a post some time ago about variable coming from regex taking more space than the same string defined directly IIRC
[Eily]: and if there's XS, make sure the scalar holds a string representation, that sounds like bad practice though (forcing that on the call side)
[choroba]: You should never pass $1 without double quotes to a sub
[choroba]: or "I should never", at least
[choroba]: that's not the sub's business

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