added whole content

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Fedor Katurov 2022-11-03 10:38:11 +06:00
parent 1b5df685cb
commit 8b25e0631a
70 changed files with 5962 additions and 19 deletions
content/Typescript

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Useful for type checking at compile and run time:
```typescript
function isFish(pet: Fish | Bird): pet is Fish {
return (pet as Fish).swim !== undefined;
}
```
Usage:
```typescript
const pet = getSmallPet();
if (isFish(pet)) {
pet.swim();
} else {
pet.fly();
}
```