Variable interpolation of object methods

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Dear Monks

I am new to perl. Please can you tell me how I achieve varaible interpolation of the an object method e.g

print "'$gene->display_id'\n";
[download]

This gives 'Bio::EnsEMBL::Gene=HASH(0x2c88e90)->display_id' Whereas I want the value in single quotes. I tried rmoving the single quotes and adding backslahes but to no avail. There is nothing in my book about how to do this.

thanks

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Re: Variable interpolation of object methods by BrowserUk (Patriarch) on Oct 30, 2010 at 22:57 UTC
Somewhat obscure, but logical: `print "'${ \$gene->display_id }'";` [download] Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. RIP an inspiration; A true Folk's Guy	[reply] [d/l]
Re^2: Variable interpolation of object methods by choroba (Cardinal) on Oct 30, 2010 at 23:22 UTC
Or, even more obscure: `print "'@{[$gene->display_id]}'\n";` [download]	[reply] [d/l]
Re^3: Variable interpolation of object methods by Anonymous Monk on Oct 30, 2010 at 23:37 UTC
Any chance of an explanation rather than ever increasing obscurity ? :-D	[reply]
Re^4: Variable interpolation of object methods by johngg (Canon) on Oct 31, 2010 at 00:45 UTC
Re^4: Variable interpolation of object methods by ambrus (Abbot) on Oct 31, 2010 at 10:21 UTC
Re^5: Variable interpolation of object methods by tod222 (Pilgrim) on Oct 31, 2010 at 16:00 UTC
Some notes below your chosen depth have not been shown here
Re^2: Variable interpolation of object methods by Anonymous Monk on Oct 30, 2010 at 23:18 UTC
Browseruk, can you explain why your deferencing method worked but mine didn't. I thought perl was deferencing the refernce for the gene object by using the -> notation. Whta exactly are you deferencing as the display_id method doesn't retrun a reference. thanks	[reply]
Re^3: Variable interpolation of object methods by Anonymous Monk on Oct 30, 2010 at 23:21 UTC
are you creating a reference to this variable `$gene->display_id` and then deferencing it straight away with `${ }` Why do you have to do this? Why doesnt perl perform variable interpolation of these types of things out of the box as it were?	[reply] [d/l] [select]
Re^4: Variable interpolation of object methods by BrowserUk (Patriarch) on Oct 30, 2010 at 23:55 UTC
Re: Variable interpolation of object methods by choroba (Cardinal) on Oct 30, 2010 at 22:20 UTC
Use list: `print "'",$gene->display_id,"'\n";` [download]	[reply] [d/l]
Re: Variable interpolation of object methods by Anonymous Monk on Oct 30, 2010 at 22:28 UTC
I had a guess at this to deference the gene object reference but this just printed out nothing `print "${$gene}{'display_id'}\n";`	[reply] [d/l]