What value do classes bring over having objects without classes?
It ensures consistency across the objects, as well as ensuring that certain objects will have certain properties.
How does a class relate to a prototype?
Classes are syntactic sugar around prototypes.
How do you assign a type to a property in TypeScript?
By using columns to specify its type.
eg. title : string;
How do you define a constructor for a class in TypeScript?
By using the constructor keyword as if you were defining a method.
eg.
constructor(title:string, message:string) {
this.title = title;
this.message = message;
}
What are methods?
Functions that belong to our classes.
How do you define the return type of a method in TypeScript?
By using semicolons, after which you write the return type.
eg. doSomething() : string { //…
What is a getter in TypeScript?
A property that does some logic to return a value.
How do you define a getter in TypeScript?
By using the get keyword and defining the rest like a function.
eg. get messageStatus() : string { //…
How do you call a getter of a class in TypeScript?
As if you were accessing one of its properties.
eg. message.messageStatus;
What is a setter in TypeScript?
A property that updates data while providing some additional logic.
How do you define a setter in TypeScript?
By using a setter and defining the rest like a function that takes in a value and assigns it to a private property.
eg.
private _isSent : boolean;
set isSent(value:boolean) {
this._isSent = value;
}
How do you use a setter in TypeScript?
By using an assignment operator to pass in the value it takes.
eg. message.isSent = true;
