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Is there a performance gain in using single quotes vs double quotes in ruby?
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$ ruby benchmark_quotes.rb
user system total real
assign single 0.110000 0.000000 0.110000 ( 0.116867)
assign double 0.120000 0.000000 0.120000 ( 0.116761)
concat single 0.280000 0.000000 0.280000 ( 0.276964)
concat double 0.2...
How to get current time and date in C++?
Is there a cross-platform way to get the current date and time in C++?
24 Answers
24
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Search and replace in bash using regular expressions
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Use sed:
MYVAR=ho02123ware38384you443d34o3434ingtod38384day
echo "$MYVAR" | sed -e 's/[a-zA-Z]/X/g' -e 's/[0-9]/N/g'
# prints XXNNNNNXXXXNNNNNXXXNNNXNNXNNNNXXXXXXNNNNNXXX
Note that the subsequent -e's are processed in order. Also, the g flag for the expression will matc...
How to find out if an item is present in a std::vector?
All I want to do is to check whether an element exists in the vector or not, so I can deal with each case.
18 Answers
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How do I save and restore multiple variables in python?
I need to save about a dozen objects to a file and then restore them later.
I've tried to use a for loop with pickle and shelve but it didn't work right.
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Find if current time falls in a time range
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How to count the number of matches? For example I want to count how many saturdays and sundays are in the range.
– pbies
Sep 4 '13 at 19:28
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SQL Server Operating system error 5: “5(Access is denied.)”
I am starting to learn SQL and I have a book that provides a database to work on. These files below are in the directory but the problem is that when I run the query, it gives me this error:
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Spring - @Transactional - What happens in background?
I want to know what actually happens when you annotate a method with @Transactional ?
Of course, I know that Spring will wrap that method in a Transaction.
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Codeigniter - no input file specified
I am a beginner in Codeigniter and I saw a CI tutorial and was just trying to do a simple thing. I downloaded the CI and added this file to controller directory, but it won't work.
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Assigning variables with dynamic names in Java
I'd like to assign a set of variables in java as follows:
7 Answers
7
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