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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
... be obvious, this is bad news. Java's type system actually allows this at compile time. The JVM will "helpfully" throw an ArrayStoreException at runtime. Scala's type system prevents this problem because the type parameter on the Array class is invariant (declaration is [A] rather than [+A]).
No...
Django Rest Framework: Dynamically return subset of fields
As recommended in the blogpost Best Practices for Designing a Pragmatic RESTful API , I would like to add a fields query parameter to a Django Rest Framework based API which enables the user to select only a subset of fields per resource.
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Difference between Repository and Service Layer?
...user has access to.
In ASP.NET MVC + EF + SQL SERVER, I have this flow of communication:
Views <- Controllers -> Service layer -> Repository layer -> EF -> SQL Server
Service layer -> Repository layer -> EF This part operates on models.
Views <- Controllers -&g...
Covariance, Invariance and Contravariance explained in plain English?
...elation. The simplest example is assignment. The statement
x = y;
will compile only if typeof(y) ≤ typeof(x). That is, we have just learned that the statements
ArrayList<String> strings = new ArrayList<Object>();
ArrayList<Object> objects = new ArrayList<String>();
w...
How to create a custom attribute in C#
...mportant that you understand what attributes are:
Attributes are metadata compiled into your program. Attributes themselves do not add any functionality to a class, property or module - just data. However, using reflection, one can leverage those attributes in order to create functionality.
So, fo...
How do I update a formula with Homebrew?
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IntelliJ IDEA jump from interface to implementing class in Java
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How to change line width in IntelliJ (from 120 character)
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Node.js / Express.js - How does app.router work?
... you define a route (which is why your routes still worked even though you commented out app.use(app.router)).
A commenter has brought up another point about the order of static and router that I hadn't addressed: the impact on your app's overall performance.
Another reason to use router above stat...
UITableView, Separator color where to set?
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