A replacement for let bindings in Swift function builders

let.swift

import SwiftUI

func `let`<Value, Return>(_ expression: Value, body: (Value) -> Return) -> Return {
  body(expression)
}

struct ContentView: View {
  var body: some View {
    GeometryReader { geometry in
      `let`(geometry.size.width / 2) { lineWidth in
        VStack {
          Rectangle().fill(Color.red).frame(width: lineWidth)
          Rectangle().fill(Color.green).frame(width: lineWidth)
          Rectangle().fill(Color.blue).frame(width: lineWidth)
        }
      }
    }
  }
}