CODEWITHSUNDEEP
scalafunctional-programming
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Reputation: 25

Why this method currying can run in such a way

I have confused about the code below. Why this can run? And what is the meaning of the .isEmpty. In the process of calling test, and I am mysterious about the { means what? A new Function?

def test(age:Int)(name:name_class => name_class): String = {
  val str: String = name.toString()+age+""
  print(str)
  str
}
test(19){
  x =>
    name_class("dage1")
}.isEmpty

Upvotes: 0

Views: 66

Answers (1)

jwvh
jwvh

Reputation: 51271

  • def test - test is a method.
  • (age:Int) - It takes an Int parameter. We'll call it age.
  • (name:name_class => name_class) - It takes a 2nd parameter (curried) that is a function that takes a name_class and returns a name_class. We'll call that function name.
  • : String - Method test returns a String.

...

  • test(19) - Let's invoke the test method. The 1st argument, age, will be 19.
  • { - The 2nd argument to test starts here. It might be multiple lines of code so we'll use {...} instead of (...). (Actually not needed in this case.)
  • x=> - This is a function that takes a name_class. We'll call it x. (And ignore it hereafter.)
  • name_class("dage1") - Return a name_class.
  • } - All done with the 2nd argument to test.
  • .isEmpty - Test the String that test returns to see if it is empty.

Upvotes: 3

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