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Return from lambda forEach() in java
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Here filter restricts the stream to those items that match the predicate, and findFirst then returns an Optional with the first matching entry.
This looks less efficient than the for-loop approach, but in fact findFirst() can short-circuit - it doesn't generate the entire filtered stream and then ...
How to update a git clone --mirror?
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This is the command that you need to execute on the mirror:
git remote update
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Mean per group in a data.frame [duplicate]
I have a data.frame and I need to calculate the mean per group (i.e. per Month , below).
8 Answers
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How do I choose between Semaphore and SemaphoreSlim?
... documentation states that the SemaphoreSlim is a lightweight alternative and doesn't use Windows Kernel semaphores. This resource states that the SemaphoreSlim is much faster. In what situations does the SemaphoreSlim make more sense over the Semaphore and vice versa?
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“unadd” a file to svn before commit
I was in the middle of doing a recursive svn add/commit, and a folder which did not have the proper ignore properties was included. I've got about 100 uploaded binary files versioned now, but I haven't committed yet.
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Why doesn't println! work in Rust unit tests?
I've implemented the following method and unit test:
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Inserting a Link to a Webpage in an IPython Notebook
...e, certain special characters like "(" or ")" may brake the file/page path and lead to the link not working. I fixed it by replacing them with the code equivalents found here and then everything worked. theukwebdesigncompany.com/articles/entity-escape-characters.php
– Afflatus
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What's the difference between interface and @interface in java?
...f touch - at any rate I've been working on a small Java project this week, and using Intellij IDEA as my IDE, for a change of pace from my regular .Net development.
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Multiple inheritance for an anonymous class
...two (or more) interfaces? Alternatively, how can it both extend a class and implement an interface?
For example, I want to create an object of anonymous class that extends two interfaces:
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Fragment or Support Fragment?
I am developing an app that supports Android >= 4.0. It uses fragments from the android.app package. As I am facing problems with the older fragment implementation in 4.0, like this one , that are already fixed in the support library, I am considering switching back to the fragment implementation...