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How to assign colors to categorical variables in ggplot2 that have stable mapping?
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What do (lambda) function closures capture?
...: b + a)(i)
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>>> adders[1](3)
4
>>> adders[2](3)
5
The scope here is created using a new function (a lambda, for brevity), which binds its argument, and passing the value you want to bind as the argument. In real code, though, you most likely will have an ordinary functio...
PostgreSQL return result set as JSON array?
...that looks like this:
{"a":[1,2,3], "b":["value1","value2","value3"]}
9.5 and up
We can leverage the json_build_object function:
SELECT
json_build_object(
'a', json_agg(t.a),
'b', json_agg(t.b)
)
FROM t
You can also aggregate the columns, creating a single row, and the...
联网 App 入门专题：5 课从共享留言到带图商品墙（附 .aia 源码与服务端） ...
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Streaming a video file to an html5 video player with Node.js so that the video controls continue to
What is the right way to handle streaming a video file to an html5 video player with Node.js so that the video controls continue to work?
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Convert.ChangeType() fails on Nullable Types
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edited Feb 3 '15 at 13:29
answered Aug 20 '10 at 14:29
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client secret in OAuth 2.0
...Igor Čordaš
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What is the difference between the states selected, checked and activated in Android?
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answered Jan 10 '13 at 15:59
Martin HarveyMartin Harvey
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What is a “thread” (really)?
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159
A thread is an independent set of values for the processor registers (for a single core). Sinc...