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All the Perl that's Practical to Extract and Report

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  • Surely:

    is "$french_for{'$num'}", 'un', 'single quoted variable key';

    Will fail. You've single quoted '$num' hence you're looking for the key "\$num".
    • Yes, that's the failure, but I don't know why that should be obvious because if you add diag "'$num'" to the end of that script, you get this:

      # 'one'

      In other words, a variable in single quotes will interpolate if it's embedded in a double quoted string but not used as the key to a hash or an index into an array. That seems a bit odd and it would be nice if it were documented better. I should submit a patch for perltrap if it's not documented.