DarkStar - 1 year ago 73

Scala Question

I am working on Coursera Assignment and in Week 2. This week assignment is not tough but very confusing.

I wrote below code and it works fine

`def union(s:Set[Int], t:Set[Int]):Set[Int] = s union t`

But if I use type to create alias of Set and rewrite above as

`type Set = Int => Boolean`

def union(s:Set, t:Set):Set = s union t

Now I get error for union is not a member of Set

Answer Source

```
def union(s:Set[Int], t:Set[Int]):Set[Int] = s union t
```

This works because `Set[T]`

defines a function named `union`

, which is called in the above code.

```
type Set = Int => Boolean
def union(s:Set, t:Set):Set = s union t
```

This doesn't work because functions don't have a method named `union`

.