Code shared from the Temper Playground

playground.temper

export class Rectangle(
  public width: Float64,
  public height: Float64,
) {
  public area(): Float64 {
    width * height
  }

  public toString(): String {
    "Rectangle: ${width} x ${height}"
  }
}

let rectangle = { width: 1.5, height: 2.0 };
console.log("${rectangle}");
console.log("Area: ${rectangle.area()}");