Scala and Spark for Big Data Analytics

Anonymous functions

Sometimes in your code, you don't want to define a function prior to its usage, maybe because you will use it in one place. In functional programming, there's a type of function that is very suitable to this situation. It's called an anonymous function. Let's demonstrate the use of anonymous functions using the previous example of transferring money:

def TransferMoney(money: Double, bankFee: Double => Double): Double = {  money + bankFee(money)}

Now, let's call the TransferMoney() method with some real value as follows:

 TransferMoney(100, (amount: Double) => amount * 0.05)

Lambda expression: As already stated, Scala supports first-class functions, which means functions can be expressed in function-literal syntax as well; ...