Documentation
- TypeScript Deep Dive — The definitive guide to TypeScript and possibly the best TypeScript book
- Write doc as comment for functions in TypeScript → https://tsdoc.org/ → playground (interactive)
Inheritance and extends (Official doc)
A class can reused the properties and methods of the base class.
protected, private, public, readonly, staticprivate= can be accessed only within the class and even their sub-classes won't be allowed to use their private properties and attributes
public= By default, all members of a class in TypeScript are public. All the public members can be accessed anywhere without any restrictions.
- Very similar, some cases → choose one of 2 → the same!
- Almost all features in
interfaceare available intype
- Key distinction:
typecannot be re-opened to add new properties vsinterfaceis extendable!
Type
T<T> (a type variable) → Generics / type variable : nếu we use any, chúng ta không biết function returns type gì?This
T allows us to capture the type the user provides → use this info later!Union types (
varName: A | B)Lưu ý là
A và B không thể ở dạng boolean | object được! Chúng có thể là {a:boolean} | {x: string}key in, keyofTroubleshooting