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In CSS what is the difference between “.” and “#” when declaring a set of styles?
...he difference between # and . when declaring a set of styles for an element and what are the semantics that come into play when deciding which one to use?
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How to style the parent element when hovering a child element?
... exist a CSS parent selector , but is it possible to style a parenting element when hovering a child element without such a selector?
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Java 8 Lambda function that throws exception?
I know how to create a reference to a method that has a String parameter and returns an int , it's:
25 Answers
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How to do ssh with a timeout in a script?
I'm executing a script connecting via password-less SSH on a remote host. I want to set a timeout, so that if the remote host is taking an infinite time to run, I want to come out of that ssh session and continue other lines in my sh script.
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Using scanf() in C++ programs is faster than using cin?
...don't know if this is true, but when I was reading FAQ on one of the problem providing sites, I found something, that poke my attention:
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Removing multiple keys from a dictionary safely
I know how to remove an entry, 'key' from my dictionary d , safely. You do:
14 Answers
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How to merge specific files from Git branches
I have 2 git branches branch1 and branch2 and I want to merge file.py in branch2 into file.py in branch1 and only that file.
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Ruby on Rails production log rotation
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Option 1: syslog + logrotate
You can configure rails, to use the systems log tools.
An example in config/environments/production.rb.
# Use a different logger for distributed setups
config.logger = SyslogLogger.new
That way, you log to syslog, and can use default logrotate tools to rotate t...
How do I test if a string is empty in Objective-C?
How do I test if an NSString is empty in Objective-C?
30 Answers
30
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How to check for a valid Base64 encoded string
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It's pretty easy to recognize a Base64 string, as it will only be composed of characters 'A'..'Z', 'a'..'z', '0'..'9', '+', '/' and it is often padded at the end with up to three '=', to make the length a multiple of 4. But instead of comparing these, you'd be better off ignoring the exceptio...