RCov: The difference between "code coverage" and "total coverage"
Code coverage is the ratio of code lines kissed by a test vs. the total number of lines in your source files. This sounds meaningful, but isn't.
Total coverage additionally ignores whitespace and comments when computing the coverage ratio, which is what you want.
Related cards:
Differences between transactions and locking
Web applications can be used by multiple users at the same time. A typical application server like Passenger has multiple worker processes for a single app. In a distributed deployment setup like we use at makandra you w...
There is no real performance difference between "def" and "define_method"
You can define methods using def or define_method. In the real world, there is no performance difference.
define_method is most often used in metaprogramming, like so:
define_method :"#{attribute_name}_for_realsies?" do
do_things...
PostgreSQL: Difference between text and varchar columns
PostgreSQL offers three character types for your columns:
-
character varying(n)(also calledvarcharor juststring): Contents are limited to n characters, smaller contents are allowed. -
character(n): All contents are padded with spa...
The Difference Between jQuery’s .bind(), .live(), and .delegate()
The difference between .bind(), .live(), and .delegate() is not always apparent. Having a clear understanding of all the differences, though, will help us write more concise code and prevent bugs from popping up in our interactive applications.
The Difference Between Width and Flex Basis | Geddski
Within a Flexbox layout, there are multiple CSS attributes that may affect a child's basis (the initial width before flexing). You might be confused how flex-basis, width, min-width and the intrinsic width of your content play together.
The...
The JavaScript Object Model: A deep dive into prototypes and properties
Speaker today is Henning Koch, Head of Development at makandra.
This talk will be in German with English slides.
Introduction
As web developers we work with JavaScript every day, even when our backend code uses anothe...
Invoices: How to properly round and calculate totals
While it might seem trivial to implement an invoice that sums up items and shows net, gross and vat totals, it actually involves a lot of rules and caveats. It is very easy to create invoices where numbers don't add up and a few cents are missing....
Lightning Talk: Coverage based Test Case Prioritization in Ruby on Rails
For my computer science bachelor's thesis I programmed and evaluated a CLI Test Case Prioritization (TCP) tool for makandra. It has been written as a Ruby Gem and was tested and evaluated against one Ruby on Rails project....
CSS: Matching against attributes and their values (or parts of them)
You probably know that you can use CSS selectors to match against elements and their attributes, such as:
a[title] { /* any <a> that has a "title" */ }
a[data-fancy="true"] { /* any <a> that has their "data-fancy" attribute set to "true" *...
The difference between ‘return false;’ and ‘e.preventDefault();’ | CSS-Tricks
The difference is that return false; takes things a bit further in that it also prevents that event from propagating (or “bubbling up”) the DOM.