What is the `some` keyword in Swift(UI)?

Question

The new SwiftUI tutorial has the following code:

struct ContentView: View {
    var body: some View {
        Text(         


        

Answer 1

A simple use case that springs to mind is writing generic functions for numeric types.

/// Adds one to any decimal type
func addOne(_ x: Value) -> some FloatingPoint {
    x + 1
}

// Variables will be assigned 'some FloatingPoint' type
let double = addOne(Double.pi) // 4.141592653589793
let float = addOne(Float.pi) // 4.141593

// Still get all of the required attributes/functions by the FloatingPoint protocol
double.squareRoot() // 2.035090330572526
float.squareRoot() // 2.03509

// Be careful, however, not to combine 2 'some FloatingPoint' variables
double + double // OK 
//double + float // error