How do I initialize the property "tag"

Question

struct Tag {
    let name: String
}
struct Post {
    var title: String
    var author: String
    var tag: Tag
    init(title: String, author: String, tag: Tag) {
        self.title = title
        self.author = author
        self.tag = Tag(name: name)
    }
}
let somePost = Post(title: "p", author: "p", tag: Tag)
```structs.swift
struct Tag {
  let name: String
}
struct Post {
    var title: String
  var author: String 
  var tag: Tag
}
```

jakubhirner · Answer

Structs in swift have default initializers. You can initialise it the same way as you did with the post, it wood look like this:
```swift
struct Tag {
    let name: String
}
struct Post {
    var title: String
    var author: String 
    var tag: Tag
}
let tag = Tag(name: "some tag 1")
let firstPost = Post(title: "First Post", author: "author 1", tag: tag) 
// you can also do it directly
let secondPost = Post(title: "Second Post", author: "author 2", tag: Tag(name: "some tag 2")) 
```
This is what the initialiser really looks like:
``` swift
struct Tag {
    let name: String
init(name: String) {
    self.name = name
}
}
struct Post {
    var title: String
    var author: String 
    var tag: Tag
init(title: String, author: String, tag: tag) {
    self.title = title
    self.author = author
    self.tag = tag
}
}

Ryan Sady · Answer

Like stated above, Structs in Swift have 'default' initializers. If you don't declare an initializer within your struct the compiler does it for you based on your declared properties.  If you have optional properties or want to do certain logic in your initializer you can manually declare one and perform your logic and initialize your properties.

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Daniel Tadros

Daniel Tadros

How do I initialize the property "tag"

2 Answers

jakubhirner

jakubhirner

Ryan Sady

Ryan Sady