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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: "super" Keyword

In this lesson, we will discuss the solutions to the questions in the previous lesson.

We'll cover the following...

Question 1: Solution review #

In the previous lesson, you were given the following code:

Javascript (babel-node)
function Human() {
  this.name = "Tommy"
  this.sex =  "Male"
}
class Child extends Human {
  constructor(){
    this.age=2;
}
}
var child1 = new Child()

For the code above, you had to answer the following question:

Explanation #

Let’s incorporate each option in our code and see if it’s correct.

Option A: name and sex should be passed as parameters to Human().

Let’s do that and see the result.

Javascript (babel-node)
function Human(name,sex) {
  this.name = "Tommy"
  this.sex =  "Male"
}
class Child extends Human {
  constructor(){
    this.age=2;
}
}
var child1 = new Child()

The error is still there, so this is not the issue. This makes sense since we are setting definite values for name and sex, so we ...