Do "Optional.reduce" and "Bool.reduce" have common names?

[anon9791410]

@jrose

…either we should have a way to put methods on every type or we shouldn't.

SwiftUI is partially an experiment to test those waters, I think. They're nice!

Conditionally apply modifier in SwiftUI

I'm trying to figure out an efficient way to conditionally apply modifiers within a swift view In this example, I want to be able to turn off the overlay and tapGesture struct TestView: View { var showOverlay:Bool = true var activeTap:Bool = true var body: some View { Text("Hello, World!") .overlay(Circle().foregroundColor(.red)) .onTapGesture { print("tapped") } } } both the .overlay and .onTapGesture are extensions…

But there are other possibilities, if we can get a standard library boxing type.

struct Struct {
  @Wrapped var value = "🐈"
}

Struct().$value { "🏃 \($0)" }
Struct().$value.if(isSnackTime) { "🏃 \($0)" }

@propertyWrapper struct Wrapped<Value> {
  let wrappedValue: Value
  var projectedValue: Self { self }
}

extension Wrapped {
  typealias Transform = (Value) throws -> Value

  func callAsFunction(transform: Transform) rethrows -> Value {
    try transform(wrappedValue)
  }

  func `if`(_ condition: Bool, transform: Transform) rethrows -> Value {
    condition
      ? try transform(wrappedValue)
      : wrappedValue
  }
}

…just make the $ do what the ¢ does here, and remove the need for parentheses.

prefix operator ¢
prefix func ¢<Value>(value: Value) -> Wrapped<Value> {
  .init(wrappedValue: value)
}

(¢"🐈") { "🏃 \($0)" }
(¢"🐈").if(isSnackTime) { "🏃 \($0)" }