23 replies

class questions

Hey, i have a few questions about classes given this code:

class Message {
  constructor(message) {
    this._message = message
  }
 
  get message() {
    return this._message
  }
}

x = new Message("example message")
console.log(x.message)

class Message {
  constructor(message) {
    this._message = message
  }
 
  get message() {
    return this._message
  }
}

x = new Message("example message")
console.log(x.message)

1) why does the

this

this

variable need to have a different identifer (in this case _) to prevent it from giving this error?

"Uncaught TypeError: Cannot set property message of #<Example> which has only a getter
    at new Example"

"Uncaught TypeError: Cannot set property message of #<Example> which has only a getter
    at new Example"

2) if i try to use a function that isn't a getter to return a

this

this

value, like below, it returns

"ƒ getMessage() { return this._message; }"

"ƒ getMessage() { return this._message; }"

rather than "example message". Why is this? Is there anything like this with setters too?

class Message {
  constructor(message) {
    this._message = message
  }
 
  getMessage() {
    return this._message
  }
}

class Message {
  constructor(message) {
    this._message = message
  }
 
  getMessage() {
    return this._message
  }
}

3) why may you want to store a class in a variable? e.g.

const x = class Message {...}

const x = class Message {...}

Thanks in advance.

KP-C

Kevin Powell - Community•2y ago•

23 replies

snxxwyy

class questions

Hey, i have a few questions about classes given this code:

class Message {
  constructor(message) {
    this._message = message
  }
 
  get message() {
    return this._message
  }
}

x = new Message("example message")
console.log(x.message)

class Message {
  constructor(message) {
    this._message = message
  }
 
  get message() {
    return this._message
  }
}

x = new Message("example message")
console.log(x.message)

1) why does the

this

this

variable need to have a different identifer (in this case _) to prevent it from giving this error?

"Uncaught TypeError: Cannot set property message of #<Example> which has only a getter
    at new Example"

"Uncaught TypeError: Cannot set property message of #<Example> which has only a getter
    at new Example"

2) if i try to use a function that isn't a getter to return a

this

this

value, like below, it returns

"ƒ getMessage() { return this._message; }"

"ƒ getMessage() { return this._message; }"

rather than "example message". Why is this? Is there anything like this with setters too?

class Message {
  constructor(message) {
    this._message = message
  }
 
  getMessage() {
    return this._message
  }
}

class Message {
  constructor(message) {
    this._message = message
  }
 
  getMessage() {
    return this._message
  }
}

3) why may you want to store a class in a variable? e.g.

const x = class Message {...}

const x = class Message {...}

Thanks in advance.

class questions

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