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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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ActiveRecord: size vs count
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edited Jul 10 '12 at 22:15
Jo Liss
22.5k1414 gold badges101101 silver badges150150 bronze badges
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What is sr-only in Bootstrap 3?
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.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px;
overflow: hidden;
clip: rect(0,0,0,0);
border: 0;
}
Is it important or can I remove it? Works fine without.
It's important, don't remove it.
You should always consider screen readers for acces...
How to convert ASCII code (0-255) to its corresponding character?
How can I convert, in Java, the ASCII code (which is an integer from [0, 255] range) to its corresponding ASCII character?
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What's the algorithm to calculate aspect ratio?
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203
I gather you're looking for an usable aspect ratio integer:integer solution like 16:9 rather th...
Matplotlib tight_layout() doesn't take into account figure suptitle
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10 Answers
10
Active
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jQuery : eq() vs get()
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answered Jan 17 '11 at 3:09
StevenSteven
16.8k1212 gold badges5959 silver badges112112 bronze badges
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Possible reasons for timeout when trying to access EC2 instance
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edited May 12 '10 at 6:00
answered May 11 '10 at 19:55
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Fastest way to remove first char in a String
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edited Jul 11 '10 at 7:02
answered Jul 11 '10 at 6:44
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Catching error codes in a shell pipe
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20
If you really don't want the second command to proceed until the first is known to be successful...