day_71.md

Day 71

Saurabh Jamadagni
1st December, 2022

Downloading data from Wikipedia

• Wikipedia returns a very specific format of json, so decode accordingly.
• Use enum to switch between states. It is good practice and also so much simpler than guessing what a boolean will be at a certain state.

case .loaded:
    ForEach(pages, id: \.pageid) { page in
        Text(page.title)
            .font(.headline)
        + Text(": ") +
        Text("Page description here")
            .italic()
    }

• Notice how we can use + to add text views together? This lets us create larger text views that mix and match different kinds of formatting.

Sorting Wikipedia results

• This will be done using the Comparable protocol.
• It allows us to compare different instances of a struct. (More on this protocol later, soon in a blog post)
• But, comparable compares every property of the struct for the instances to determine the relation.
• In this case we just have to compare the titles.
• So basically overload the comparison operator.

static func <(lhs: Page, rhs: Page) -> Bool {
    lhs.title < rhs.title
}

• Notice it is a static function at it is a function of the struct and not a particular instance.
• Sometimes the result froma URL will have optionals and garbage conditionals that will only make your code messy.
• In this case create computed properties in the struct itself that do that to keep things cleaner.