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Re: Should perl implement ,= or maybe overload .= (array context)

by theorbtwo (Prior)
on Aug 23, 2006 at 17:41 UTC ( #569149=note: print w/ replies, xml ) Need Help??


in reply to Should perl implement ,= or maybe overload .= (array context)

To me, making .= do array concat seems rather off, for similar reasons to + not doing string concat. It's just not the right operator for the job. ,= is rather more interesting, but I don't really see a reason to introduce it; push @foo, @bar works just like you'd propose @foo ,= @bar to do.


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Re^2: Should perl implement ,= or maybe overload .= (array context)
by EvanCarroll (Chaplain) on Aug 23, 2006 at 18:47 UTC

    I agree fully with the example on '+', and '.' operators and that's why I thought ,= was more consistent with perl philosophy; but favoring a function'al approach rather than an operator approach for arrays seems more consistent with PHP a la array_new. As a side note though the analogy doesn't hold entirely true, perl -e'print "4 foo"+"1"' will demonstrate a purpose for +'ing two strings.

    I like '.=' more because it is clear what it should do in either context, and i don't really see a need for a ',='. Either operator would have a lower level of precedence too.



    Evan Carroll
    www.EvanCarroll.com
      We've debated adding ,= to Perl 6, but so far have decided it would too easy to confuse with the .= operator visually. I suppose we could add ,= just for completeness and then come back in six months and deprecate anyone who is using it. :-)

      As for unifying with the .= operator, that wouldn't work at all in Perl 6 because we've taken over dot for method calls, and .= already indicates that you want to turn a non-mutating method call into a mutating method call. The append operator in Perl 6 is the ~=, but in Perl 6 the ~ character has very strong implications of stringification, and we wouldn't want to break that.

      All that being said, it'd be trivial for you to add your own ,= operator to Perl 6, and that's probably where we should leave it.

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