Scala Macwire: Inject all Implementations of a trait for factory pattern Macwire is an amazing DI (Dependency Injection) container for scala. It allows to wire up the dependencies required by a type to instantiate itself as long as the type is registered with it. If you are coming from C# background and are used to… Continue reading »
PartialFunction (Partially defined functions) In Scala A partial function is a unary function which is only defined for certain domain (i.e. input) values. They can be introduced anonymously. They can also be defined using PartialFunction trait. In order to understand partial functions, first introduce a type Student. It has three properties, id, sType and name… Continue reading »
Partially Applied Functions in Scala Partial applied functions allow us to set any parameter of a function. After partial functions, a function is created with the remaining parameters of the function. In this post we are going to discuss the details about this feature. Let’s create a function which accepts three parameters. It uses the… Continue reading »
Currying in Scala In our .net blog [shujaat.net], we have discussed about currying in details. Just to quote from there: Currying is a transformation technique in functional programming space. It is used to convert a function with multiple parameters to a set of functions with single parameter each. It can be used to create refined… Continue reading »
Structural Sub Typing in Scala Structural typing is compile time checked duck-typing. It allows us to specify the characteristics of a required type instead of an actual concrete type. Let’s create a new SBT project ScalaTyping. In this post we are going to discuss how Scala supports structural sub-typing. Let’s create a simple Scala SBT… Continue reading »
Views / Implicit Conversions in Scala Scala supports implicit conversion by providing the support for implicit methods. In this post we are going to discuss briefly about this feature. Let us first create a Scala SBT project. We are naming the project as ScalaImplicits. Let’s add a type Student. It is a case class with… Continue reading »
Apache Thrift And its usage in C# Services are based on the idea of RPC (Remote Procedure Calls). Apache Thrift is just another framework allowing us to write services but it makes it easier to write them by enabling polyglot development. Apache Thrift enables writing cross language services development. Why do we need Apache Thrift… Continue reading »
Observables in Javascript Observable pattern allows us to execute code blocks when a change happens. There are different implementations to support observables in different programming languages. In ECMAScript 6, Object.Observe() was introduced for the same purpose. It allows us to write functions which get called when an object’s properties are changed. Let’s look at the… Continue reading »
Variable Hoisting in Javascript If you are coming from C# or Java background into C#, you might find scopes as very strange in java script. In this post, we will be trying to understand the scopes in C#. Specially, how javascript uses hoisting to for these out-of-ordinary scopes. In other programming languages, we limit the… Continue reading »
In this post, we will be trying to understand how we can unit test javascript code using Karma and Jasmine. Karma Let’s first install Karma. It is available as a node package, so we can use npm to install it. Here we are using Karma for running our unit tests. Karma launches a web server… Continue reading »