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In addition to the init() method, we can also provide our structs with custom methods that instances can call. These instance methods are created like a normal function but within the scope of the structure itself:

struct Dog {
  var age : Int
  var isGood : Bool

  init(age: Int, isGood: Bool) {
    self.age = age
    self.isGood = isGood
  }

  // We've added a bark() method:
  func bark() {
    print("woof")
  }
}

In the example above, we added a method bark() using the func keyword — it doesn’t have any parameters, nor does it return anything. The method syntax looks like exactly of function, the major difference being a method is specific to the structure’s instances.

Great, now we can create an instance of Dog that has the .bark() method: 

var bucket = Dog(age: 4, isGood: true)
bucket.bark() // Prints: woof

After we defined our instance, bucket, we can call the method using dot syntax and a pair of parentheses after the method name.

Instructions

1.

Create an instance method inside Band called pumpUpCrowd:

  • The pumpUpCrowd() method should not have any parameters and returns a String.
  • Inside the pumpUpCrowd() method, return an empty string ("") for now.
2.

Inside the body of the method:

  • Check if self.isActive is true.
  • If it evaluates to true, return "Are you ready to ROCK?".
  • Otherwise, return "...".
3.

Create an instance of Band called fooFighters that takes the arguments:

  • genre: "rock".
  • members: 6.
  • isActive: true.
4.

Print out the returned value of calling the .pumpUpCrowd() on fooFighters.

What do you think will print?

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