I actually already did toy with the idea of interpolating the output of grep into a string, but it turned out to fail to gain any ground; it works, but it's no shorter, plus to get identical output you would have to also set $" to '' (empty string), which takes additional keystrokes..

My 37 keystroke method: 

sub invert {
    #234567890123456789012345678901234567
    join'',grep/[^\Q@_\E]/,map{chr}1..255
}

[download]

And now without join, but with double-quotish interpolation: 

sub invert {
    #234567890123456789012345678901234567
    "@{[grep/[^\Q@_\E]/,map{chr}1..255]}"
}

[download]

Dave

In reply to Re: Re: Re: Re: Re:^2 Golf: string complement by davido
in thread Golf: string complement by japhy

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