Re^6: Burned by precedence rules (== true)

In Perl 6 we can use positive boolean context, which helps readability a little:

if ?$x == ?$y {...}
if ?$x != ?$y {...}
[download]

We can use junctions, which again helps the different case more than the same case:

if not $x ^ $y {...}
if $x ^ $y {...}
[download]

or if you prefer:

if !one($x,$y) {...}
if one($x,$y) {...}
[download]

That's probably enough ways to do it...

Comment on Re^6: Burned by precedence rules (== true) Select or Download Code

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Re^7: Burned by precedence rules (eqv) by tye (Sage) on Dec 31, 2008 at 02:14 UTC
Nah. Clearly this demonstrates the utility of a few "Boolean comparison" operators: `if $isFree ?= $isEasy if $isOne !?= $isOther unlink $dev eqv unlink $prod or die "Inconsistent state"; system $verifyUser neqv system $verifyAdmin or die "You are not just either a User or an Admin";` [download] ;) - tye	[reply] [d/l]
Re^8: Burned by precedence rules (eqv) by TimToady (Parson) on Dec 31, 2008 at 03:17 UTC
Well, we can't use `eqv` because we already use that for something else, but we do have a Boolean not-equal already: `$x ?^ $y` [download] What we don't have is a Boolean equal. I thought about adding: `$x ?= $y` [download] but people would probably think that means: `$x = $x ? $y;` [download] which is nonsense, but they'd still think it. `:-)` Anyway, the utility is not worth the extra complexity, in my opinion. Comparing two Booleans for equivalence is an odd enough thing to do that I don't mind if it looks a little odd.	[reply] [d/l] [select]
Re^9: Burned by precedence rules (eqv) by tilly (Archbishop) on Dec 31, 2008 at 03:58 UTC
What about saying that !( potential boolean operator ) means the boolean negation of the boolean operator? That would naturally give you the logical operators !&& (nand), !\|\| (nor) and !^ (not xor). The last would, of course, be Boolean equals. (I can't believe I just suggested that.)	[reply]
Re^9: Burned by precedence rules (eqv) by tye (Sage) on Dec 31, 2008 at 03:47 UTC
Note that I did include a winky smiley. But I saved the clincher argument for now: Perl 6 is becoming so like VB, it will be very surprising to VBers when the purpose of `eqv` is so different. :-D - tye	[reply]


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