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Re: Passing logical operators on as content of scalar

by Eily (Prior)
on Feb 08, 2018 at 17:14 UTC ( #1208724=note: print w/replies, xml ) Need Help??

in reply to Passing logical operators on as content of scalar

Well, you might not do much better than that easily actually. The Dispatch table design pattern can help (you associate functions with some keys) which gives a basic example like that:

use strict; use warnings; use feature 'say'; my %operators = ( '>' => sub { $_[0] > $_[1] }, '==' => sub { $_[0] == $_[1] }); sub test { my ($op, $left, $right) = @_; die "Unknown operator: $op" unless exists $operators{$op}; say "$left $op $right" and return if $operators{$op}($left, $right); say "$right $op $left" if $operators{$op}($right, $left); } test "==", 1, 1; test ">", 2, 3; test ">", 4, 5; test "<", 6, 7; __DATA__ 1 == 1 3 > 2 5 > 4 Unknown operator: < at line 12.

But if you want your own sentence to be written you'll need a more complex structure where for each key you have either several functions (one to compare, one to print) or a function and a template or something. I don't have the time to go any further than that at the moment though ^^".

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