I’m creating a base class that will be used to validate the coordinates property in the setter. Being new to Typescript and Javascript, I’m not sure what I’m doing but it seems as though it’s the right way to do validation cleanly.
As of now I have a base class Base setup and the child class Property extending it.
export default class Base {
_coord: number = 0;
set coord(coord: number) {
console.log(coord);
}
}
Property sets coord in the constructor which lets me validate it from the child class. My question is: what is the difference between using this._coord and this.coord from the child class? I have tried setting coord with this._coord which doesn’t use the setter method in the base so I’m using this.coord:
export class Property extends Base {
address: string;
postcode: number;
bedrooms: number;
constructor(address: string,
postcode: number,
bedrooms: number) {
super();
this.address = address;
this.postcode = postcode;
this.bedrooms = bedrooms;
this.coord = 100; // Setting base property
}
}
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1
_coord and coord are completely different properties of your class. You could name them completely different. Seems _coord is where you want to store your value after validation. So you could avoid accidentaly using it directly by marking it private. Or you can use a private JS property #coord. That way you’d ensure always pass through the validation when assigning:
export default class Base {
private _coord: number = 0;
set coord(coord: number) {
console.log(coord);
// some validation here
this._coord = coord;
}
get coord(){
return this._coord;
}
}