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Why are arrays covariant but generics are invariant?
...y versions of Java and C# did not include generics (a.k.a. parametric polymorphism).
In such a setting, making arrays invariant rules out useful polymorphic programs.
For example, consider writing a function to shuffle an array, or a function that tests two arrays for equality using the Objec...
Why use make over a shell script?
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The general idea is that make supports (reasonably) minimal rebuilds -- i.e., you tell it what parts of your program depend on what other parts. When you update some part of the program, it only rebuilds the parts that depend on that. While you could do this ...
Single Line Nested For Loops
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The best source of information is the official Python tutorial on list comprehensions. List comprehensions are nearly the same as for loops (certainly any list comprehension can be written as a for-loop) but they are often faster than using a for...
What are libtool's .la file for?
What are libtool's .la files for? How are they used with a shared object?
3 Answers
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Facebook Open Graph not clearing cache
...eems as though Facebook is caching old values of my meta tags. Old values for Attributes og:title and og:url are still used, even though I have changed them already.
...
ASP.NET MVC Controller Naming Pluralization
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Some MVC Frameworks use plurals, however the MVC project templates contains a controller called AccountController thus suggesting singlular naming.
It doesn't matter. As with most things in the Asp.net MVC framework the choice is yours. Th...
How to do if-else in Thymeleaf?
...: the th:switch and th:case attributes introduced in Thymeleaf 2.0.
They work as you'd expect, using * for the default case:
<div th:switch="${user.role}">
<p th:case="'admin'">User is an administrator</p>
<p th:case="#{roles.manager}">User is a manager</p>
<...
What does “#define _GNU_SOURCE” imply?
...CE has nothing to do with license and everything to do with writing (non-)portable code. If you define _GNU_SOURCE, you will get:
access to lots of nonstandard GNU/Linux extension functions
access to traditional functions which were omitted from the POSIX standard (often for good reason, such as b...
Append to a file in Go
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This answers works in Go1:
f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
panic(err)
}
defer f.Close()
if _, err = f.WriteString(text); err != nil {
panic(err)
}
...
Git Gui: Perpetually getting “This repository currently has approximately 320 loose objects.”
...ed answer is overlooking the fact that Git is communicating a possible performance issue to you. This should be fixable by running this command from the command line:
cd path/to/your/git/repo
git gc --aggressive
From the output of git help gc:
Runs a number of housekeeping tasks within the current...