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Hidden features of Ruby
Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language.
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What are free monads?
I've seen the term Free Monad pop up every now and then for some time, but everyone just seems to use/discuss them without giving an explanation of what they are. So: what are free monads? (I'd say I'm familiar with monads and the Haskell basics, but have only a very rough knowledge of cat...
Visual Studio displaying errors even if projects build
...solution. It displays totally random errors, but the projects build. Right now, I have 33 files with errors, and I can see red squiggly lines in all of them.
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How do you create an asynchronous method in C#?
... build your own asynchronous methods to consume. So I have this code right now that consumes my method:
3 Answers
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Predicate in Java
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static boolean isEven(int num) {
return (num % 2) == 0; // simple
}
Now, given a List<Integer>, you can process only the even numbers like this:
List<Integer> numbers = Arrays.asList(1,2,3,4,5,6,7,8,9,10);
for (int number : numbers) {
if (isEven(number)) {
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Updating address bar with new URL without hash or reloading the page
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You can now do this in most "modern" browsers!
Here is the original article I read (posted July 10, 2010): HTML5: Changing the browser-URL without refreshing page.
For a more in-depth look into pushState/replaceState/popstate (aka ...
How to avoid reinstalling packages when building Docker image for Python projects?
...c66c7
As you can see above, this time docker uses cache during the build. Now, let's update requirements.txt:
# requirements.txt
pytest==2.3.4
ipython
Below is the output of docker build:
Sending build context to Docker daemon 5.12 kB
Sending build context to Docker daemon
Step 0 : FROM dockerf...
How do you tell if caps lock is on using JavaScript?
... this on a dupe/similar question and was updated by another user that this now has Chrome support. I confirmed this, so now works across all major browsers - and should be the best solution to this question
– Ian Clark
Aug 26 '16 at 7:49
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How does Tortoise's non recursive commit work?
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On 26.08.2011 22:39, Ryan J Ollos wrote:
For several months now I've been seeing the following dialog box appear when
initiating Commit. It frequently happens when attempting to commit following
a merge.
The thing I have noticed lately however is that if I Cancel and ...
Remove ActiveRecord in Rails 3
Now that Rails 3 beta is out, I thought I'd have a look at rewriting an app I have just started work on in Rails 3 beta, both to get a feel for it and get a bit of a head-start. The app uses MongoDB and MongoMapper for all of its models and therefore has no need for ActiveRecord. In the previous ver...