What is a constructor and other questions

JavaScript
1

Tell us what’s happening:
Hi, I solved the exercise by looking at the example but I didn’t understand it. I wrote my questions inside the code. Thank you!

Your code so far


// Only change code below this line
class Vegetable{
constructor(name){ //what is constructor and what it's doing here?
  this.name = name; //what is "this"? why do I need to define name = name?//
}
}
// Only change code above this line

const carrot = new Vegetable('carrot');
console.log(carrot.name); // Should display 'carrot'

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36.

Challenge: Use class Syntax to Define a Constructor Function

Link to the challenge:

3

Edit: apologizes the email answer didnt go very well XD

There is also a few things that could be interesting to mention.

  • constructor(){ } is a function. And is an exact analogous of what you would write inside a constructor Function:
function Question(name){
this.name = name;
this.sayMe = ( ) =>console.log(this.name)
}

//instantiation
let Q1 = new Question("What is a constructor?")


class QuestionClass{
//class' body
constructor(name){
this.name= name;
this.sayMe = ( ) =>console.log(this.name
}
// class body ends. 
}
//instantiation
let Q2 = new QuestionClass("What is a constructor?")

So here constructor(params) = Question(params)

  • The keyword this is defined when you instantiate the class or the constructor function, and takes the value of the current object.
    (it’s much more complex but enough to start.)
1 Like