the property inside constructor

Asked Dec 02 '19 at 10:55

Active Dec 02 '19 at 10:55

Viewed 36 times

I am new to JavaScript and currently studying constructor of class concept on Codecademy.

And my question is, what is the difference to make property between with this keyword and with let when property name is not same as the one in parameter?

I am doing some exercise on Codecademy, and when I put properties in the constructor like this, it says incorrect( but syntax error does not happen)

class Surgeon {
  constructor(name, department) {
    this._name = name;
    this._department = department;
    let _remainingVacationDays = 20;
  }

*correct answer on Codecademy

class Surgeon {
  constructor(name, department) {
    this._name = name;
    this._department = department;
    this._remainingVacationDays = 20;
  }

Thanks!

asked Dec 02 '19 at 10:55

Nagisa Ando

Related: [How does the “this” keyword work?](https://stackoverflow.com/questions/3127429/how-does-the-this-keyword-work) – Quentin Dec 02 '19 at 10:58
Related: [What's the difference between using “let” and “var”?](https://stackoverflow.com/questions/762011/whats-the-difference-between-using-let-and-var) – Quentin Dec 02 '19 at 10:59
1

When you're using `this`, your property will be available in whole class, like in other methods. With `let` your property will be only available in current scope, you can't access them in other methods of your class. – Sarsa Murmu Dec 02 '19 at 10:59
['var' vs 'this' vs constructor-parameter variables](https://stackoverflow.com/questions/4354418) – adiga Dec 02 '19 at 10:59
@SarsaMurmu — Instance, not class. – Quentin Dec 02 '19 at 11:00
@Quentin Oh, My bad. – Sarsa Murmu Dec 02 '19 at 11:02
Thanks guys! I will through the related questions. :) – Nagisa Ando Dec 03 '19 at 18:04

the property inside constructor

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