Re: True or False? A Quick Reference Guide

[Juerd]

A quicker reference ;)

0/FALSE: 0, "0", "", undef
1/TRUE:  everything else 

 AND    OR     XOR   NOT
0&0=0  0|0=0  0^0=0  !0=1
0&1=0  0|1=1  0^1=1  !1=0
1&0=0  1|0=1  1^0=1
1&1=1  1|1=1  1^1=0
&      |      ^      ~     <-- bitwise
&&     ||            !     <-- logical, high precedence
and    or     xor    not   <-- logical, low precedence

[Juerd]

Perl 6:

0/FALSE: 0, "0", "", undef ("0" is true if the type is Str)
1/TRUE:  everything else

 AND    OR     XOR   NOT
+&     +|     +^     +^    <-- bitwise, numeric
~&     ~|     ~^     ~^    <-- bitwise, string
?&     ?|     ?^     ?^    <-- bitwise, boolean
&&     ||     ^^     !     <-- logical, high precedence
and    or     xor    not   <-- logical, low precedence

• The difference between logical and bitwise boolean is that logical AND and OR return an operand, while bitwise AND and OR return boolean values (the original values are lost).
• ?^/^^, and ?^/! are practically the same.
• ^^ was missing in Perl 5.
• +^, ~^, ?^ are both XOR and NOT, depending on whether they are used infix (in between) or prefix (in front).