FishMonger
Veteran
/ Moderator
Mar 2, 2014, 8:16 AM
Post #2 of 2
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Re: [homer_3] Can someone tell me what this syntax means?
[In reply to]
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Can't Post
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That's a var assignment.
The shift function removes the first element of an array shortening the array by 1 element, presumably this line is in a subroutine so it would be acting on the @_ array. In this case the value shifted off of the array is being assigned to $self.
See: perldoc -f shift
http://perldoc.perl.org/functions/shift.html
Here, we see that $self is hash reference and one of its keys is '_invert'. Since it's being used in void context, my assumption is that the '_invert' key is being added to the hash and its value will default to undef.
If the '_invert' key was already in the hash, then that line would do nothing and would be pointless.
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