jaycosaur

interface Dog {
  (food: string): void;
  type: string;
}

const dogFactory = (breed: string): Dog => {
  const eat = (food: string) => console.log(`Eating ${food}.`);
  eat.type = breed;
  return eat;
};

jaycosaur

from typing import Protocol


class Dog(Protocol):
    type: str

    def __call__(self, food: str) -> None:
        pass

jaycosaur

from typing import NewType

Celsius = NewType("Celsius", float)
Fahrenheit = NewType("Fahrenheit", float)


def convert_to_fahrenheit(value: Celsius) -> Farenheit:
    return Farenheit((value * 9 / 5) + 32)

jaycosaur

type Celsius = number;
type Fahrenheit = number;

function convertToCelsius(value: Fahrenheit): Celsius {
  return (value * 9) / 5 + 32;
}

function convertToFahrenheit(value: Celsius): Fahrenheit {
  return ((value - 32) * 5) / 9;
}

jaycosaur

type Celsius = {
  type: "celsius";
  value: number;
};

const celsius = (value: number): Celsius => ({
  value,
  type: "celsius",
});