Re^4: Burned by precedence rules (== true)

in reply to Re^3: Burned by precedence rules (== true)
in thread Burned by precedence rules

I'm sure i shouldnt say this, but more than once I have written

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

which I think is a fair exception to your rule. I kinda view ! and !! as "boolean constructors", and so long as both sides of your (in)equality are guaranteed to be a "boolean" obtained one of these constructors you can compare them.

But I'm really just nit-picking. :-)

---
$world=~s/war/peace/g

Comment on Re^4: Burned by precedence rules (== true) Download Code

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Re^5: Burned by precedence rules (== true) by ikegami (Patriarch) on Dec 30, 2008 at 20:09 UTC
There's a logical operator for that: `xor` `if ( !$x == !$y) ) # bool($x) == bool($y) if ( !$x != !$y ) # bool($x) != bool($y)` [download] can be written as `if ( !($x xor $y) ) # bool($x) == bool($y) if ( $x xor $y ) # bool($x) != bool($y)` [download] Unforunately, both sets have readability issues.	[reply] [d/l] [select]
Re^6: Burned by precedence rules (== true) by TimToady (Parson) on Dec 30, 2008 at 20:49 UTC
In Perl 6 we can use positive boolean context, which helps readability a little: `if ?$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...	[reply] [d/l] [select]
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 $verifyAdmin or die "You are not just either a User or an Admin";` [download] ;) - tye	[reply] [d/l]
Re^8: Burned by precedence rules (eqv) by TimToady (Parson) on Dec 31, 2008 at 03:17 UTC
Re^9: Burned by precedence rules (eqv) by tilly (Archbishop) on Dec 31, 2008 at 03:58 UTC
Re^9: Burned by precedence rules (eqv) by tye (Sage) on Dec 31, 2008 at 03:47 UTC
Re^6: Burned by precedence rules (== true) by demerphq (Chancellor) on Dec 31, 2008 at 00:01 UTC
Ah yes, scalar xor, i always forget about it. Personally the !$x == !$y makes more sense to me than !($x xor $y). But whatever. --- $world=~s/war/peace/g	[reply]

In Section Meditations