ECMAScript Cookbook

How to do it...

1. Open your command-line application and navigate to your workspace.
2. Create a new folder named 07-05-getters-read-only.
3. Copy or create an index.html that loads and runs a main function from main.js.
4. Create a main.js file with the Rocket class that defines a read only property:

class Rocket { 
  constructor(name) { 
    this.name = name; 
  } 
 
  get readOnlyValue() { 
    return 'Cant' touch this.'; 
  } 
} 

5. Create a main function that creates an instance of the Rocket class. Read from the writable and read-only properties, then try to write to them:

export function main() { const saturnV = new Rocket('Saturn V'); console.log(saturnV.name); saturnV.name = 'Saturn Five'; console.log(saturnV.name); console.log(saturnV.readOnlyValue); // throws error ...