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How to prevent ifelse() from turning Date objects into numeric objects
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edited Jun 20 at 9:12
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answered Jun 29 '16 at 7:31
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Shell equality operators (=, ==, -eq)
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It's the other way around: = and == are for string comparisons, -eq is for numeric ones. -eq is in the same family as -lt, -le, -gt, -ge, and -ne, if that helps you remember which is which.
== is a bash-ism, by the way. It's...
What's the “average” requests per second for a production web application?
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It's still showing less than 200,000/sec - the new monitoring page is grafana.wikimedia.org
– OJW
Mar 25 at 16:37
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python multithreading wait till all threads finished
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t3.start()
t1.join()
t2.join()
t3.join()
Thus the main thread will wait till t1, t2 and t3 finish execution.
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Can I add a custom attribute to an HTML tag?
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You can amend your !DOCTYPE declaration (i.e. DTD) to allow it, so that the [XML] document will still be valid:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
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<!ATTLIST tag myAttri CDATA #IMPLIED>
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Is there any way to git checkout previous branch?
I sort of want the equivalent of cd - for git. If I am in branch master and I checkout foo , I would love to be able to type something like git checkout - to go back to master , and be able to type it again to return to foo .
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IIS7 Overrides customErrors when setting Response.StatusCode?
...whatever is appropriate. For example, if I make a custom 404 page and name it 404.aspx, I could put <% Response.StatusCode = 404 %> in the contents in order to make it have a true 404 status header.
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How to convert JSON to XML or XML to JSON?
...format to object or viceversa. I am not sure in the Json.NET framework, is it possible to convert a string in JSON to XML format and viceversa?
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MySQL indexes - what are the best practices?
...that I will be searching or selecting using a WHERE clause but sometimes it doesn't seem so black and white.
7 Answers
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variable === undefined vs. typeof variable === “undefined”
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For undeclared variables, typeof foo will return the string literal "undefined", whereas the identity check foo === undefined would trigger the error "foo is not defined".
For local variables (which you know are declared somewhere), no such error would occur, hence the identity check....