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How to check if array is empty or does not exist? [duplicate]
... Cornelissen
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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
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105
This thread mentions:
If you don't remember the empty tree sha1, you can always derive it ...
MongoDB: How to update multiple documents with a single command?
...m not sure about when this change happened but, Mongodb v2.2.2 does this a bit differently. db.collection.update( <query>, <update>, <options> ) where options is a set of key value pairs. See documentation: docs.mongodb.org/manual/applications/update
– Techple...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...数不是3的倍数，那么，最后剩下的1或2位数会被转成4或7bits，则其它的每3位数字会被编成 10，12，14bits，编成多长还要看二维码的尺寸（下面有一个表Table 3说明了这点）
Alphanumeric mode 字符编码。包括 0-9，大写的A到Z（没有小写...
Installing pip packages to $HOME folder
...packages/.
Note, that the above is true for Python 2.6. There has been a bit of controversy among the Python core developers about what is the appropriate directory location on Mac OS X for PEP370-style user installations. In Python 2.7 and 3.2, the location on Mac OS X was changed from $HOME/.lo...
Is there a way to view past mysql queries with phpmyadmin?
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Ok, so I actually stumbled across the answer.
phpMyAdmin does offer a brief history. If you cl...
Programmatically scroll to a specific position in an Android ListView
...ions/5540223/…
– AFD
Jun 5 '14 at 10:08
what is v.getHeight()?
– Panache
Mar ...
What is the best way to concatenate two vectors?
...y, "i
< v1.size()"), VecProxy access time, although constant, is also
a bit slower than that of vectors.
This approach can be generalized to n vectors. I haven't tried, but
it shouldn't be a big deal.
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Changing navigation title programmatically
...S 11.4
– Antony Wong
Jul 27 '18 at 10:02
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What are bitwise operators?
...into it in either an academic or professional setting, so stuff like these bitwise operators really escapes me.
9 Answers
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