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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
In JavaScript you can declare a variable and if it’s undefined , you can check variable == undefined ; I know that, but how can you compare a value that you don’t know yet if it’s in memory?
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Server is already running in Rails
When I am starting rails server using rails s command it is showing A server is already running. Check C:/Sites/folder/Pids/Server.pids
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How to find the files that are created in the last hour in unix
How to find the files that are created in the last hour in unix
6 Answers
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What's the Linq to SQL equivalent to TOP or LIMIT/OFFSET?
How do I do this
14 Answers
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difference between foldLeft and reduceLeft in Scala
I have learned the basic difference between foldLeft and reduceLeft
7 Answers
7
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How to parse XML to R data frame
I tried to parse XML to R data frame, this link helped me a lot:
4 Answers
4
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What is the best way to implement a “timer”? [duplicate]
What is the best way to implement a timer? A code sample would be great! For this question, "best" is defined as most reliable (least number of misfires) and precise. If I specify an interval of 15 seconds, I want the target method invoked every 15 seconds, not every 10 - 20 seconds. On the other ha...
error: passing xxx as 'this' argument of xxx discards qualifiers
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How do I base64 encode (decode) in C?
I have binary data in an unsigned char variable.
I need to convert them to PEM base64 in c.
I looked in openssl library but i could not find any function.
Does any body have any idea?
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How to get a list of properties with a given attribute?
I have a type, t , and I would like to get a list of the public properties that have the attribute MyAttribute . The attribute is marked with AllowMultiple = false , like this:
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