diff options
Diffstat (limited to 'perl6.html.markdown')
| -rw-r--r-- | perl6.html.markdown | 67 |
1 files changed, 39 insertions, 28 deletions
diff --git a/perl6.html.markdown b/perl6.html.markdown index 7a8c7525..f86c3d64 100644 --- a/perl6.html.markdown +++ b/perl6.html.markdown @@ -130,25 +130,12 @@ if long-computation() -> $result { ## The categories are : ### - "prefix" : before (like `!` in `!True`). -### "postfix" : after (like `++` in `$a++`). -### "infix" : in between (like `*` in `4 * 3`). -### "circumfix" : around (like `[`-`]` in `[1, 2]`). -### "post-circumfix" : around, after another term (like `{`-`}` in `%hash{'key'}`) +### - "postfix" : after (like `++` in `$a++`). +### - "infix" : in between (like `*` in `4 * 3`). +### - "circumfix" : around (like `[`-`]` in `[1, 2]`). +### - "post-circumfix" : around, after another term (like `{`-`}` in `%hash{'key'}`) -## The precedence list can be found here : http://perlcabal.org/syn/S03.html#Operator_precedence -## But first, we need a little explanation about associativity : - -### Binary operators: -$a ! $b ! $c; # with a left-associative `!`, this is `($a ! $b) ! $c` -$a ! $b ! $c; # with a right-associative `!`, this is `$a ! ($b ! $c)` -$a ! $b ! $c; # with a non-associative `!`, this is illegal -$a ! $b ! $c; # with a chain-associative `!`, this is `($a ! $b) and ($b ! $c)` -$a ! $b ! $c; # with a list-associative `!`, this is `infix:<>` - -### Unary operators: -!$a! # with left-associative `!`, this is `(!$a)!` -!$a! # with right-associative `!`, this is `!($a!)` -!$a! # with non-associative `!`, this is illegal +## The associativity and precedence list are explained below. ## Alright, you're set to go ! @@ -180,24 +167,48 @@ $arg ~~ &bool-returning-function; # true if the function, passed `$arg` as an ar ### Their string equivalent are also avaiable : `lt`, `le`, `gt`, `ge`. 3 > 4; -## * Sort comparison -### They return one value of the `Order` enum : `Less`, `Same` and `More` (which numerify to -1, 0 or +1). -1 <=> 4; # sort comparison for numerics -'a' leg 'b'; # sort comparison for string -$obj eqv $obj2; # sort comparison using eqv semantics - -## * Generic ordering -3 before 4; # True -'b' after 'a'; # True - ## * Range constructors 3 .. 7; # 3 to 7, both included ### `^` on either side them exclusive on that side : 3 ^..^ 7; # 3 to 7, not included (basically `4 .. 6`) # * And, Or +3 && 4; # True. Calls `.Bool` on `3` +0 || False; # False. Calls `.Bool` on `0` ## Short-circuit (and tight) $a && $b && $c; # returns the first argument that evaluates to False, or the last argument $a || $b; + +# More operators thingies ! + +## Everybody loves operators ! Let's get more of them + +## The precedence list can be found here : http://perlcabal.org/syn/S03.html#Operator_precedence +## But first, we need a little explanation about associativity : + +### Binary operators: +$a ! $b ! $c; # with a left-associative `!`, this is `($a ! $b) ! $c` +$a ! $b ! $c; # with a right-associative `!`, this is `$a ! ($b ! $c)` +$a ! $b ! $c; # with a non-associative `!`, this is illegal +$a ! $b ! $c; # with a chain-associative `!`, this is `($a ! $b) and ($b ! $c)` +$a ! $b ! $c; # with a list-associative `!`, this is `infix:<>` + +### Unary operators: +!$a! # with left-associative `!`, this is `(!$a)!` +!$a! # with right-associative `!`, this is `!($a!)` +!$a! # with non-associative `!`, this is illegal + +## And to end the list of operators ... + +## * Sort comparison +### They return one value of the `Order` enum : `Less`, `Same` and `More` (which numerify to -1, 0 or +1). +1 <=> 4; # sort comparison for numerics +'a' leg 'b'; # sort comparison for string +$obj eqv $obj2; # sort comparison using eqv semantics + +## * Generic ordering +3 before 4; # True +'b' after 'a'; # True + ``` |