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Way to get all alphabetic chars in an array in PHP?
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Does name length impact performance in Redis?
I like to use verbose names in Redis, for instance set-allBooksBelongToUser:$userId .
4 Answers
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Mapping a function on the values of a map in Clojure
I want to transform one map of values to another map with the same keys but with a function applied to the values. I would think there was a function for doing this in the clojure api, but I have been unable to find it.
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What does .SD stand for in data.table in R
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What is the global interpreter lock (GIL) in CPython?
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ctypes - Beginner
I have the task of "wrapping" a c library into a python class. The docs are incredibly vague on this matter. It seems they expect only advanced python users would implement ctypes. Well i'm a beginner in python and need help.
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Linux chmod命令用法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...通知文件的用户
--help
输出帮助信息。
-R，--recursive
可递归遍历子目录，把修改应到目录下所有文件和子目录
--reference=filename
参照filename的权限来设置权限
-v，--verbose
无论修改是否成功，输出每个文件的信息
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Passing variables in remote ssh command
... be able to run a command from my machine using ssh and pass through the environment variable $BUILD_NUMBER
7 Answers
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Is there a way to pass optional parameters to a function?
...parameters to a function while calling it and in the function definition have some code based on "only if the optional parameter is passed"
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