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Simple explanation of MapReduce?
... to the basics for Map and Reduce.
Map is a function which "transforms" items in some kind of list to another kind of item and put them back in the same kind of list.
suppose I have a list of numbers: [1,2,3] and I want to double every number, in this case, the function to "double every number" ...
What are the git concepts of HEAD, master, origin?
As I'm learning about git, I keep coming across the terms HEAD, master, origin, and I'm not sure what the differences are. If I understand correctly, HEAD is always equal to the latest revision? And if so, is that the latest revision of the whole repository, or of a specific branch or tag? This is s...
WITH CHECK ADD CONSTRAINT followed by CHECK CONSTRAINT vs. ADD CONSTRAINT
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The first syntax is redundant - the WITH CHECK is default for new constraints, and the constraint is turned on by default as well.
This syntax is generated by the SQL management studio when generating sql scripts -- I'm assuming it's some sort of extra redundan...
How can I remove an SSH key?
...SH key uploaded on a server. The problem is I lost my ~/.ssh directory (with the original id_rsa and id_rsa.pub files).
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PHP json_encode encoding numbers as strings
I am having one problem with the PHP json_encode function. It encodes numbers as strings, e.g.
17 Answers
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How do I do a case-insensitive string comparison?
How can I do case insensitive string comparison in Python?
9 Answers
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Is it possible to break a long line to multiple lines in Python [duplicate]
... lines. But in Python , if I do this, there will be an indent error... Is it possible?
7 Answers
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Error: Can't set headers after they are sent to the client
... call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and finally res.end(data).
The error "Error: Can't set headers after they are sent." means that you're already in the Body ...
Skip callbacks on Factory Girl and Rspec
I'm testing a model with an after create callback that I'd like to run only on some occasions while testing. How can I skip/run callbacks from a factory?
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Javascript web app and Java server, build all in Maven or use Grunt for web app?
We are doing a web application with AngularJS and we like the idea of using Bower for Dependency Management and Grunt for building, running tests etc. ( Yeoman )
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