Need help. Javascipt class doesn't work. When I run it shows me error.

Question

1.00/5 (3 votes)

See more:

// This class takes a name string and greeting string in
// the constructor. Here are some examples of how this should work:
//
// g = new Greeter()
// g.greet() # => "Hello, Anonymous!"
//
// g = new Greeter("What's up", "Dog")
// g.greet() # => "What's up, Dog!"
//
// g = new Greeter("Hola")
// g.greet() # => "Hola, Anonymous!"
 
// Unfortunately, this code isn't quite working.
 
class Greeter {
  constructor(name, greeting) {
    this.name = name;
    this.greeting = greeting;
  }
    
  greet() {
    const name = this.name;
    const greeting = this.greeting;
    
    if (!name) {
      name = "Anonymous";
    }
    if (greeting = undefined) {
      greeting = "Hello";
    }
    
    return "${greeting}, ${name}!";
  }
}
 
g = new Greeter("Hi")
g.greet()

What I have tried:

Need help. Javascipt class doesn't work.  When I run it shows me error.

Posted 27-Oct-21 16:10pm

EnverGurbanov

Updated 27-Oct-21 22:11pm

Rick York

v2

Add a Solution

Comments

Dave Kreskowiak 27-Oct-21 22:19pm

...and the error would be...?

Patrice T 27-Oct-21 22:20pm

"When I run it shows me error."
And you plan to show us the error message ?

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2021-10-27T22:11:00

Multiple errors in your code:

JavaScript

if (greeting = undefined)

You are assigning[^] the value undefined to the greeting variable here. Instead, you should be testing for equality[^].

JavaScript

name = "Anonymous";
...
greeting = "Hello";

You have declared both name and greeting as const[^]. That means you cannot change their value. Any attempt to do so will result in an error.

Use let[^] to declare a variable which can be changed.

JavaScript

return "${greeting}, ${name}!";

You are returning the literal string ${greeting}, ${name}!. You should be using a template string[^] instead. That means using back-ticks (`) instead of quotes (" or ') to start and end your string.

JavaScript

g = new Greeter("Hi")

Not technically an error, but you haven't declared the g variable anywhere. Use let g = ... instead.

JavaScript

g.greet()

You're not doing anything with the value returned from this method. You should either store it somewhere for later use, or display it to the user somehow.

In future, make sure you provide a complete and precise description of the error(s) you are trying to solve.

Need help. Javascipt class doesn't work. When I run it shows me error.

1 solution

Solution 1

Add your solution here

Preview 0

Existing Members

...or Join us