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Re: Error in Camel Book Ver2?by redcloud (Parson) |
on Dec 21, 2000 at 10:14 UTC ( [id://47741]=note: print w/replies, xml ) | Need Help?? |
Well, look at that example line this way: $pi ||= 3; is like saying: $pi = $pi || 3; Now, the || operator short circuits if the first operand is true, so if $pi has any value that is true (i.e. it is not 0, "", or undef -- any others?) then the value of the right hand side will be $pi, otherwise it'll be 3. So, this is a way to say that the default value of $pi is 3, because that's what it'll be set to if it hasn't been set to something else already. So, in your case, you might do: $list_info{subscribed_message} ||= $subscribed_message; Make sense? Update:This doesn't work, though if "" is a valid value.
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