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RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
...lets
How perform validation and display error message in same form in JSP?
HttpServletResponse sendRedirect permanent
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How do I replace NA values with zeros in an R dataframe?
...the mutate and summarize _at and _all function variants can be found here: https://rdrr.io/cran/dplyr/man/summarise_all.html
Additionally, I found helpful demonstrations and collections of examples here: https://blog.exploratory.io/dplyr-0-5-is-awesome-heres-why-be095fd4eb8a
Attributions and Apprec...
How can I specify a branch/tag when adding a Git submodule?
...o:
[submodule "SubmoduleTestRepo"]
path = SubmoduleTestRepo
url = https://github.com/jzaccone/SubmoduleTestRepo.git
You have a submodule object (named SubmoduleTestRepo in this example) in your Git repository. GitHub shows these as "submodule" objects. Or do git submodule status from a com...
Does C# have extension properties?
...etimes language design is a very long game!"
Source: comments section in https://blogs.msdn.microsoft.com/dotnet/2018/11/12/building-c-8-0/
I stopped counting how many times over the years I opened this question with hopes to have seen this implemented.
Well, finally we can all rejoice! Micros...
How to upload a file in Django? [closed]
...ad files and show them as list. To download source for the project, visit https://github.com/axelpale/minimal-django-file-upload-example or clone it:
> git clone https://github.com/axelpale/minimal-django-file-upload-example.git
Update 2013-01-30: The source at GitHub has also implementation ...
Visual Studio support for new C / C++ standards?
...f public replies to this, most of them blaming their users. Like this one:
https://devblogs.microsoft.com/cppblog/iso-c-standard-update/
Now, the Visual C++ compiler team receives the occasionally question as to why we haven’t implemented C99. It’s really based on interest from our users. Whe...
How can mixed data types (int, float, char, etc) be stored in an array?
...oblems when MacOS addressing advanced from 24 bits to 32 bits in System 7.
https://en.wikipedia.org/wiki/Tagged_pointer#Examples
On x86_64 you can still use the high bits as tags with care. Of course you don't need to use all those 16 bits and can leave out some bits for future proof
In prior versi...
What are the differences between git branch, fork, fetch, merge, rebase and clone?
...;- tab completion for branches will work.
GUI Learning Tool
You may find https://learngitbranching.js.org/ useful in learning some of the base concepts. Screen shot:
Video: https://youtu.be/23JqqcLPss0
Finally, 7 key lifesavers!
You make changes, add and commit them (but don't push) and then ...
Explaining Python's '__enter__' and '__exit__'
...r__ and __exit__ methods by Googling, so to help others here is the link:
https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers
https://docs.python.org/3/reference/datamodel.html#with-statement-context-managers
(detail is the same for both versions)
object.__enter__...
C++ performance vs. Java/C#
...It'll do just fine.
One the Java side, @Swati points out a good article:
https://www.ibm.com/developerworks/library/j-jtp09275
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edited May 23 '17 at 12:10
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