Re: ~~ and list literal

Please check perlop under the subheading
Smartmatch Operator

..It is also unique in that all other Perl operators impose a context (usually string or numeric context) on their operands, autoconverting those operands to those imposed contexts. In contrast, smartmatch infers contexts from the actual types of its operands and uses that type information to select a suitable comparison mechanism...
Moreover, using this
```
print( "x" ~~ ("x", "y", "z") );
[download]
```
with use warnings in your script turn on, it would shout"Useless use of a constant (x),(y) in void context". Which shows you are inferring a void context using smartmatch like so.

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

Comment on Re: ~~ and list literal Download Code

Replies are listed 'Best First'.
Re^2: ~~ and list literal by Anonymous Monk on Oct 25, 2012 at 23:43 UTC
TIL that parentheses don't imply a list context. Also these don't: `"x" ~~ qw(x y z) "x" ~~ sort(x y z)` [download] I find that only this do: `"x" ~~ @{["x", "y", "z"]}` Any other which I missed?	[reply] [d/l] [select]
Re^3: ~~ and list literal by 2teez (Vicar) on Oct 26, 2012 at 00:03 UTC
TIL that parentheses don't imply a list context Ofcourse, I never said parentheses imply a list context, it's the `comma operator` that does. But, what I did say/wrote is that the smartmatch `..infers contexts from the actual types of its operands and uses that type information to select a suitable comparison mechanism...` Any other which I missed? Please, check perlop for detailed information If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply]