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How do I copy a hash in Ruby?
I'll admit that I'm a bit of a ruby newbie (writing rake scripts, now). In most languages, copy constructors are easy to find. Half an hour of searching didn't find it in ruby. I want to create a copy of the hash so that I can modify it without affecting the original instance.
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推荐系统算法初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
推荐系统算法初探最近因为PAC平台自动化的需求，开始探坑推荐系统。这个乍一听去乐趣无穷的课题，对于算法大神们来说是这样的：而对于刚接触这个领域的我来...最近因为PAC平台自动化的需求，开始探坑推荐系统。这个乍一...
How to check if a variable is not null?
I know that below are the two ways in JavaScript to check whether a variable is not null , but I’m confused which is the best practice to use.
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What to learn for making Java web applications in Java EE 6? [closed]
My goal is to make web applications!
7 Answers
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Function Pointers in Java
This may be something common and trivial, but I seem to be having trouble finding a concrete answer. In C# there is a concept of delegates, which relates strongly to the idea of function pointers from C++. Is there a similar functionality in Java? Given that pointers are somewhat absent, what is the...
What do the parentheses around a function name mean?
In one of my project source files, I found this C function definition:
3 Answers
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What is the purpose of .PHONY in a Makefile?
...oes .PHONY mean in a Makefile? I have gone through this , but it is too complicated.
9 Answers
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Can't access RabbitMQ web management interface after fresh install
I've installed the latest RabbitMQ server (rabbitmq-server-3.3.0-1.noarch.rpm) on a fresh Centos 5.10 VM according to the instructions on the official site.
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Better techniques for trimming leading zeros in SQL Server?
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