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Courses Plus Student 5,242 Pointsre-assigning const? why re-define parent class "Person" properties- "name" and "age", in the child class "Student"?
in the following code the const "dances" is being re-define in the child class, how come it is not an error?
also
why " this.name = name; this.age = age;" being re-defined in "Student" child class? isn't the whole idea of inheritance is using what is already in the parent class.
class Person {
dance() {
const dances = [
'waltz',
'tango',
'mambo',
'foxtrot'
];
console.log(`${this.name} is doing the ${dances[Math.floor(Math.random() * dances.length)]}!`);
}
constructor({ name, age, eyeColor = 'brown' } = {}) {
this.name = name;
this.age = age;
this.eyeColor = eyeColor;
}
}
class Student extends Person{
dance(traditional) {
if(traditional) {
super.dance();
return;
}
const dances = [
'lyrical',
'tap',
'ballet',
'jazz'
];
console.log(`${this.name} is doing the ${dances[Math.floor(Math.random() * dances.length)]}!`);
}
constructor({ name, age, interestLevel = 5 } = {} ) {
super({name,age});
this.name = name;
this.age = age;
this.interestLevel = interestLevel;
this.grades = new Map;
}
}
1 Answer
Andreas Nystrรถm
8,887 PointsThe const "dances" is not globally outside the class scope. You can have the same const <variable> in every method if you want, because the scope is only in that method. For example.
// This will return hello and is ok because the const is in a method and cant get reached outside that method
myMethod1 () {
const string = 'hello';
return string
}
// This will return goodbye and is ok because the const is in a method and cant get reached outside that method
myMethhod2() {
const string = 'goodbye';
return string
}
The other question I'm not sure of to be honest. I wouldn't have written it like that. Hopefully someone else could help you out here.