class Animal {
constructor(name) {
this.name = name;
}
}
class Dog extends Animal {
constructor(name, breed) {
this.breed = breed; // Error line
super(name);
}
}
This code throws an error because: 1) In derived classes, 'this' cannot be used before calling super(), 2) The super() call must be the first statement in a derived constructor, 3) This is because 'this' is uninitialized until super() is called, 4) The error will be 'ReferenceError: Must call super constructor in derived class before accessing 'this'', 5) This rule enforces proper inheritance chain initialization, 6) The code can be fixed by moving super(name) before the this.breed assignment.