Simple Conditional View Closures

conditionalView.swift

import SwiftUI

@ViewBuilder
func `ifLet`<T, Content: View>(_ optional: T?, @ViewBuilder builder: ((T) -> Content)) -> some View {
	optional.map(builder)
}

@ViewBuilder
func `ifNotLet`<T, Content: View>(_ optional: T?, @ViewBuilder builder: (() -> Content)) -> some View {
	if optional == nil {
		builder()
	}
}

func `ifLet`<T, Content: View>(_ optional: T?, @ViewBuilder builder: ((T) -> Content)) -> IfLetPartialResult<T, Content> {
	IfLetPartialResult(optional, builder)
}

struct IfLetPartialResult<Wrapped, A: View> {
	var a: A?
	
	init(_ optional: Optional<Wrapped>, @ViewBuilder _ a: (Wrapped) -> A) {
		self.a = optional.map(a)
	}
	
	@ViewBuilder
	func `else`<B: View>(@ViewBuilder _ b: () -> B) -> some View {
		if a != nil {
			a
		} else {
			b()
		}
	}
}

let x: String = "TEST"

var result: some View {
	ifLet(x) {
		Text($0)
	}.else {
		Image(systemName: "paperplane")
	}
}