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Created August 9, 2020 11:48
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Composable types [typescript] - Typescript to Python field guide
interface Animal {
length: number;
eat: (food: string) => void;
}
// Fish extends the Animal interface
interface Fish extends Animal {
swim: (howLong: number) => void;
}
// fish implements the Fish interface implicitly and does not directly reference it
const fish = {
length: 12,
eat: (food: string) => console.log(`Eating ${food}`),
swim: (howLong: number) => console.log(`Swimming for ${howLong}`),
};
function doSomethingFishy(what: Fish) {
what.eat("worms");
what.swim(what.length);
}
doSomethingFishy(fish); // this is ok!
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