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MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...ton提出IoT概念也是在1999年，因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RFID标签和互联网连接起来，在1999年第一个提出了IoT这个概念。发明人TCP协议的发明人是Vinton Cerf（下图左，曾在IBM工作过...
Regular expression \p{L} and \p{N}
...n any script.
Source: regular-expressions.info
If you're going to work with regular expressions a lot, I'd suggest bookmarking that site, it's very useful.
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is guava-libraries available in maven repo?
I am looking to find guava-libraries in maven repository. It looks like guava is adding more features to google-collections library.
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How do you pass arguments to define_method?
... method you're really just nicknaming the block and keeping a reference to it in the class. The parameters come with the block. So:
define_method(:say_hi) { |other| puts "Hi, " + other }
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Merge two (or more) lists into one, in C# .NET
Is it possible to convert two or more lists into one single list, in .NET using C#?
13 Answers
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Defining a function with multiple implicit arguments in Scala
How can I define a function with multiple implicit arguments.
3 Answers
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How to get duplicate items from a list using LINQ? [duplicate]
...te that this will return all duplicates, so if you only want to know which items are duplicated in the source list, you could apply Distinct to the resulting sequence or use the solution given by Mark Byers.
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What are the differences between numpy arrays and matrices? Which one should I use?
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As per the official documents, it's not anymore advisable to use matrix class since it will be removed in the future.
https://numpy.org/doc/stable/reference/generated/numpy.matrix.html
As other answers already state that you can achieve all the operation...
Correct way to quit a Qt program?
How should I quit a Qt Program, e.g when loading a data file, and discovered file corruption, and user need to quit this app or re-initiate data file?
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Difference between java.exe and javaw.exe
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java.exe is the command where it waits for application to complete untill it takes the next command.
javaw.exe is the command which will not wait for the application to complete. you can go ahead with another commands.
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