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Reversed operators

Note! This site is about Perl 6.
If you are looking for a solution for the current production version of Perl 5, please check out the Perl 5 tutorial.

Reversed operators will reverse the meaning of the two operands. So instead of switching the two arguments as in $b cmp $a one can write $a Rcmp $b.

It is not yet implemented in Rakudo and frankly I don't yet see any use of it but I am sure others will.

I wonder if the same would also work on operators such as gt ? Could I use $x Rgt $y meaning $y gt $x ? Why is that good?

tutorial/arrays/reversed_operators.p6

#!/usr/bin/env perl6
use v6;

# spaceship operator
say 1 <=> 2;  # -1
say 2 <=> 1;  # 1

say 1 R<=> 2;  # 1
say 2 R<=> 1;  # -1

Output

tutorial/arrays/reversed_operators.p6.out

Increase
Decrease
Decrease
Increase


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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


Prev: Negated Relation Operators

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