Initalizing parameters in a struct in Swift

Question

So while learning Swift, I came across two ways to initialize parameters in a struct,

struct Fruit {
  let name: String
}

let _ = Fruit(name: "Apple")

or,

struct Fruit {
  let name: String

  init(name: String) {
    self.name = name
  }
}

let _ = Fruit(name: "Apple")

What is the difference between two or maybe which one is correct?

Both forms are identical. In a struct (unlike a class) you get the memberwise initializer for free. The explicit declaration is redundant. — vadian
– vadian, Commented Nov 26, 2021 at 10:29

Noor Ahmed Natali · Accepted Answer · 2021-11-26 10:41:47Z

2

-> For structure, we don't need to write initializer explicitly (init) as it is already included by default if attributes are not optional.

-> For classes, we have to define initializer explicitly.

-> 1st option is correct when it comes to structures.

-> if you don't want to take parameters as compulsory while creating an object of structure you can make attributes options like this

struct Sample {
   var x: Int?
}

-> For more information regarding structures and classes you can follow this link :- https://docs.swift.org/swift-book/LanguageGuide/ClassesAndStructures.html

edited Nov 26, 2021 at 10:41

answered Nov 26, 2021 at 10:30

Noor Ahmed Natali

5413 silver badges13 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Andrew Over a year ago

This is incorrect. For classes you have to explicitly state the initializer, for structs it is automatically synthesised , however you can have an initializer for structs and there is nothing wrong with that. In fact you will have to create an initializer for a struct if it is contained in a separate module due to the fact that the synthesised initializer is marked internal.

Noor Ahmed Natali Over a year ago

is it ok now..?

Sulthan Over a year ago

If the struct is in another module, the generated initializer is not always accessible.

Noor Ahmed Natali Over a year ago

struct a { var x:Int var y: b } struct b { var z:Int }. var ab = a(x: 1, y: b(z: 3))

Collectives™ on Stack Overflow

Initalizing parameters in a struct in Swift

1 Answer 1

4 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Related