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Sending a message to nil in Objective-C

As a Java developer who is reading Apple's Objective-C 2.0 documentation: I wonder what " sending a message to nil " means - let alone how it is actually useful. Taking an excerpt from the documentation: ...
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Rails Migration: Remove constraint

... 170 Not sure you can call t.address? Anyway... I would use change_column like so change_column :use...
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HTML5 doctype putting IE9 into quirks mode?

... answered Jun 30 '11 at 3:49 David WickDavid Wick 6,82722 gold badges3131 silver badges3636 bronze badges ...
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Instantiating object of type parameter

... answered Nov 18 '08 at 20:24 ericksonerickson 243k5050 gold badges360360 silver badges457457 bronze badges ...
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PostgreSQL naming conventions

...(for general SQL) here, all with several related links. Note: Postgresql 10 introduced identity columns as an SQL-compliant replacement for serial. share | improve this answer | ...
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What does 'useLegacyV2RuntimeActivationPolicy' do in the .NET 4 config?

...ng a project that used SlimDX, and therefore has unmanaged code, to .NET 4.0 I ran into the following error: 2 Answers ...
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grepping using the “|” alternative operator

The following is a sample of a large file named AT5G60410.gff: 5 Answers 5 ...
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Exclude a sub-directory using find

... 207 This works: find /home/feeds/data -type f -not -path "*def/incoming*" -not -path "*456/incomin...
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Ajax using https on an http page

... answered May 10 '11 at 17:04 DalSoftDalSoft 8,54033 gold badges3131 silver badges4444 bronze badges ...
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Sort an Array by keys based on another Array?

...dress'] = '123 fake st'; $customer['name'] = 'Tim'; $customer['dob'] = '12/08/1986'; $customer['dontSortMe'] = 'this value doesnt need to be sorted'; $properOrderedArray = array_merge(array_flip(array('name', 'dob', 'address')), $customer); //Or: $properOrderedArray = array_replace(array_flip(array...