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All the Perl that's Practical to Extract and Report

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  • I think your complaint boils down to "Ruby doesn't have 'use strict;'", combined with "Ruby can't tell the difference between a local variable and a method call". The perl 5 code that's actually equivalent to the ruby code is

    sub y {
        if false { $x = 100 }
        return $x;

    -- Note the lack of 'my' in the method; this would 'work' if use strict wasn't in effect, assuming of course that $x didn't exist elsewhere in the program. A call to y would return undef unless the program had assigned

  • It's not so much "why sigils are great" as "why bizarro heuristics for guessing variable bindings suck." Python's rules for introducing new variable bindings are stupid, but simple. Perl's are explicit and reasonable. Ruby's make me want to strangle kittens.