learn-co-curriculum / dsc-enterprise-hsbc-scala-infix-operators

Infix Operators

Using Infix Operators

In Scala, a method with one argument can be called as an infix operator

Using that rule, that’s what makes:

1.+(2)

res47: Int = 3

Look like…​

1 + 2

res48: Int = 3

Creating your own infix operator

Therefore, in Scala, if we create our class like the following:

class Foo(x:Int) {
   def bar(y:Int) = x + y
}

defined class Foo

and we want to invoke it, we can call it not only like this:

val foo = new Foo(40)
foo.bar(10) //non-infix

foo: Foo = Foo@4a614812
res49: Int = 50

but like this:

val foo = new Foo(40)
foo bar 10  // Called infix

foo: Foo = Foo@60c14a11
res50: Int = 50

Infix Operator Conclusion

• If a method has one argument you can call it in an infix manner
• This is called an infix operator