I would like to call a method from the great grandfather to the Athlete class,
How can I do that?
I tried using super.printSentence but that did not work,
Is this the correct way to invoke the method, super.printPositon() in the Athlete class?
Any suggestion on how to invoke this printSentence method?
class Person {
constructor(name) {
this.name = name;
}
printName() {
console.log(this.name);
}
}
class TeamMate extends Person {
constructor(name) {
super(name);
}
printSentence() {
console.log(super.printName(), "is an excellent teammate!" );
}
}
class SoccerPlayer extends TeamMate {
constructor(name, teamMateName, position) {
super(name, teamMateName);
this.teamMateName = teamMateName;
this.position = position;
}
printPositon() {
console.log("Positon: ", position);
}
}
class Athlete extends SoccerPlayer{
constructor(name, teamMateName, position, sport) {
super(name, teamMateName, position);
this.sport = sport;
}
printSport() {
console.log("Favorite sport: ", this.sport);
}
//If Athlete class extends from SoccerPlayer and SoccerPlayer extends from
// the TeamMate class, how can I invoke the printSentence method
// from the TeamMate class in this current Athlete class?
printGreatGrandFatherMethod() {
return this.printSentence()
}
}
const soccerPlayer = new Athlete('PLAYER1', 'Frederick', 'Defender', 'Soccer');
console.log(soccerPlayer.printGreatGrandFatherMethod());Why am I getting undefined for the name field?
Just to this.printSentence()
In inheritance (prototype or not) the this has access to all the methods.
Unless you are using private method like this:
class ClassWithPrivateMethod {
#privateMethod() {
return 'hello world';
}
}
If you think about it, if a Person has a name any class that inherited from Person will also have a member name. This is also true to any instance of a class that inherits from Person. for example:
const soccerPlayer = new SoccerPlayer('PLAYER1', 'MATE NAME', '1');
console.log(soccerPlayer.name); // Prints `PLAYER1`
printSentence() doesn't return a value, so return this.printSentence() will return undefined. And since that's what printGreatGrandFatherMethod returns, therefore console.log(soccerPlayer.printGreatGrandFatherMethod()); will log undefined.
Same goes for printName() which doesn't return a value either and therefore console.log(super.printName()) will log undefined