TypeScript adds types and visibility modifiers to JavaScript classes.
Members: Types
The members of a class (properties & methods) are typed using type annotations, similar to variables.
class Person {
name: string;
}
const person = new Person();
person.name = "Jane";Members: Visibility
Class members also be given special modifiers which affect visibility.
There are three main visibility modifiers in TypeScript.
public– (default) allows access to the class member from anywhereprivate– only allows access to the class member from within the classprotected– allows access to the class member from itself and any classes that inherit it, which is covered in the inheritance section below
class Person {
private name: string;
public constructor(name: string) {
this.name = name;
}
public getName(): string {
return this.name;
}
}
const person = new Person("Jane");
console.log(person.getName()); // person.name isn't accessible from outside the class since it's private
