On the first line, || evaluates the left side first. If it's true, it gets assigned to $ct, otherwise, $ct becomes text/plain.

On line 2, you can add parentheses as follows: 

(($ct eq 'text/plain') || ($ct eq 'text/html')) or next;

[download]

which makes it equivalent to 

next if $ct ne 'text/plain' and $ct ne 'text/html';

[download]

The "short circuiting" is most noticable in the or operator: next is evaluated only if the previous condition is false.

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: What does the short circuit || mean ? by choroba
in thread What does the short circuit || mean ? by peterr

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