Inverted syntax: Difference between revisions
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Thundergnat (talk | contribs) m (syntax highlighting fixup automation) |
Thundergnat (talk | contribs) m (→{{header|Raku}}: fix a few old references to Perl 6) |
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=={{header|Raku}}== |
=={{header|Raku}}== |
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(formerly Perl 6) |
(formerly Perl 6) |
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Raku has statement modifiers: |
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<syntaxhighlight lang="raku" line>if $guess == 6 { say "Wow! Lucky Guess!" } # Traditional |
<syntaxhighlight lang="raku" line>if $guess == 6 { say "Wow! Lucky Guess!" } # Traditional |
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say 'Wow! Lucky Guess!' if $guess == 6; # Inverted |
say 'Wow! Lucky Guess!' if $guess == 6; # Inverted |
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say 'Huh! You Guessed Rong!' unless $guess == 6; # Inverted</syntaxhighlight> |
say 'Huh! You Guessed Rong!' unless $guess == 6; # Inverted</syntaxhighlight> |
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Raku can also invert the syntax of loops: |
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<syntaxhighlight lang="raku" line>while $i { --$i } |
<syntaxhighlight lang="raku" line>while $i { --$i } |
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--$i while $i; |
--$i while $i; |
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.say if $_ %% 2 for 1..10; # list comprehension</syntaxhighlight> |
.say if $_ %% 2 for 1..10; # list comprehension</syntaxhighlight> |
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Raku has a system of metaoperators that modify the characteristics of normal operators. Among these is the <tt>R</tt> metaoperator, which is able to reverse the arguments of most infix operators (including user-defined ones). |
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So a reversed assignment is easy to write: |
So a reversed assignment is easy to write: |
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<syntaxhighlight lang="raku" line>42 R= $_; say $_; # prints 42</syntaxhighlight> |
<syntaxhighlight lang="raku" line>42 R= $_; say $_; # prints 42</syntaxhighlight> |
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