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YAP6 Operator: Junction Operators
January 07 2008
Another article of the series “Yet Another Perl 6 Operator” Perl 6 introduces a new scalar data-type: the “junction”. A junction is a single scalar value that can act like two or more values at once. example a value which acts like any(1,2,3) 1 or 2 or 3 all(@vals) all members of @vals… read moreJanuary 03 2008
Another article of the series “Yet Another Perl 6 Operator” This article is not about some set of Perl 6 operators, but rather about what happened to Perl 5 filetests operators. Short answer: They are not operators anymore. Where programmers were used to write # good ol' Perl 5 if ( -e $filename ) {… read moreYAP6 Operator: Reduce Operators - Part II
December 28 2007
Another article of the series “Yet Another Perl 6 Operator” In a previous article , we introduced the reduction operators (like '[*]' and '[~]') which produced list operators from infix operators (like '*' and '~'). There is a variant of the reduction operator that operates over its list argument producing all intermediate… read moreYAP6 Operator: The Pair Constructor
December 27 2007
Another article of the series “Yet Another Perl 6 Operator” Binary '=>' is no longer just a “fancy comma”. In Perl 6, it now constructs a Pair object that can, among other things, be used to pass named arguments to functions. my $pair = (one => 1); $pair.isa(Pair) # Bool::True $pair.key # 'one' $pair.value #… read moreYAP6 Operator: Mutating Operators
December 26 2007
Another article of the series “Yet Another Perl 6 Operator” We already have seen two Perl 6 meta-operators in articles of this series: namely, the negate and the reduction operators. These are two of the five standard meta-operators of the language. What makes meta-operators interesting is how Perl automatically generates new operators… read moreYAP6 Operator: Reduce operators
December 25 2007
Another article of the series “Yet Another Perl 6 Operator” And that’s time to take a look at another of the Perl 6 meta-operators: the reduction operator. By surrounding with square brackets an (associative) infix operator, a new list operator is created. [*] 1..10 # that's 1*2*...*10 = 10! [~] <m oo s… read moreYAP6 Operator: Iterate Operator
December 24 2007
Another article of the series “Yet Another Perl 6 Operator” If you are wondering how processing the lines of a file will look in Perl 6, the answer is something like this: my $h = open '<', $filename; for =$h { ... } (Yes, we need error handling yet. I just ommitted the… read moreDecember 21 2007
Jon Allen announced that http://perldoc.perl.org/ has been updated with Perl 5.10 documentation. This is great news as the look of the rendered PODs with syntax highlighting and many other nice effects makes me feel good. read moreYAP6 Operator: The Cross Operator
December 21 2007
Another article of the series “Yet Another Perl 6 Operator” Perl 6 provides an operator 'X', the cross operator, which combines its list operands into a sort of cartesian product of these arguments. 1,2 X 3,4 # (1,3), (1,4), (2,3), (2,4) 1,2 X 3,4 X 5,6 # (1,3,5), (1,3,6), (1,4,5), ..., (2,4,6)… read moreYAP6 Operator: Conditional Operator
December 20 2007
Another article of the series “Yet Another Perl 6 Operator” The syntax of an if-then-else expression in Perl 6 is composed by the conditional operator. say "My answer is: ", $maybe ?? 'yes' !! 'no'; The expression above is equivalent to that, which uses the if-then-else statement within a do. say "My… read moreYAP6 Operator: Negated Operators
December 19 2007
Another article of the series “Yet Another Perl 6 Operator” The design of Perl 6 includes some unification mechanisms to bring some extra power to syntax and developers. One of such artefacts is the notion of meta-operators. With them, it is possible to construct augmented operators from existing ones. The first of… read moreYAP6 Operator: Range Operators
December 18 2007
Another article of the series “Yet Another Perl 6 Operator” In Perl 6, you may construct ranges with expressions like $min .. $max $min ^.. $max $min ..^ $max $min ^..^ $max and even ^$limit These operators are Range object constructors, specified by their endpoints. These endpoints are excluded if there is ^ in the… read moreYAP6 Operator: The Default Operator
December 18 2007
Another article of the series “Yet Another Perl 6 Operator” Among the new Perl 6 operators, there is the handy operator '//', known as defined-or or the default operator. This novelty was anticipated by the introduction of this syntactic bit in Perl 5 (see the upcoming 5.10 release) — so you won’t need… read moreYAP6 Operator: The Default Operator
December 17 2007
Another article of the series “Yet Another Perl 6 Operator” Among the new Perl 6 operators, there is the handy operator '//', known as defined-or or the default operator. This novelty was anticipated by the introduction of this syntactic bit in Perl 5 (see the upcoming 5.10 release) — so you won’t need… read moreYet Another Perl 6 Operator: Boolean Operators
December 12 2007
The series “Yet Another Perl 6 Operator” is back with this brand new article In the article on coercion operators, we got to know the prefix operator '?' which converts values into Bool::True or Bool::False. Like it happens with '~' for strings, '?' is recurrent for boolean operators. In Perl 6, the… read more
