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How to use concerns in Rails 4
...with code reuse as in the example below. Basically, the idea is to extract common and / or context specific chunks of code in order to clean up the models and avoid them getting too fat and messy.
As an example, I'll put one well known pattern, the taggable pattern:
# app/models/product.rb
class P...
Locking a file in Python
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As noted by a comment at the blog post, this solution isn't "perfect", in that it's possible for the program to terminate in such a way that the lock is left in place and you have to manually delete the lock before the file becomes accessi...
What's the fastest way to convert String to Number in JavaScript?
...By this quick test I made, it actually depends on browsers.
http://jsperf.com/best-of-string-to-number-conversion/2
Implicit marked the fastest on 3 browsers, but it makes the code hard to read… So choose whatever you feel like it!
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JavaScript function in href vs. onclick
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What is the difference between visibility:hidden and display:none?
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No comment about performance of one and another? I'm curious which method to use to hide absolutely positioned elements, that get displayed and hidden often.
– Tomáš Zato - Reinstate Monica
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Can you use a trailing comma in a JSON object?
...y generating a JSON object or array, it's often easier to leave a trailing comma on the last item in the object or array. For example, code to output from an array of strings might look like (in a C++ like pseudocode):
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How to make a div 100% height of the browser window
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What are Viewport-Percentage Lengths?
From the linked W3 Candidate Recommendation above:
The viewport-percentage lengths are relative to the size of the initial containing block. When the height or width of the initial containing block is changed, they are scaled accordingly.
These units...
Adding images or videos to iPhone Simulator
... images, videos, etc onto the simulator is to drag and drop them from your computer onto the simulator. This will cause the Simulator to open the Photos app and start populating the library.
If you want a scriptable method, read on.
Note - while this is valid, and works, I think Koen's solution ...
When to use an assertion and when to use an exception
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The comment about the hard drive is wrong. Assertions are for checking for errors in your code logic. Never, ever, use them to check something that you don't control. Remember, if an assertion fails it means that your code is wro...
How to permanently remove few commits from remote branch
...ranch, and re-pushing it)
This SO answer illustrates the danger of such a command, especially if people depends on the remote history for their own local repos.
You need to be prepared to point out people to the RECOVERING FROM UPSTREAM REBASE section of the git rebase man page
With Git 2.23 (Au...