const linearFunction: ReversibleFunction<number> = {
  forward: x => 2 * x + 3,
  backward: y => 0.5 * (y - 3);
}

linearFunction.forward(1); // => 5 linearFunction.backward(5); // => 1 linearFunction.backward(linearFunction.forward(Math.PI)); // => 3.141... linearFunction.forward(linearFunction.backward(Math.PI)); // => 3.141... `

@typeparam TParam Type of the function argument. @typeparam TParam Type of the function return value.