Interface segregation principle

posts.js

// bad
class Post {
  constructor(){
  }
  
  editPost(){
    console.log('Post edited')
  }
  
  createPost(){
   console.log('Post created')
  }
  
  deletePost(){
   console.log('Post created')
  }
}

// moderators edit posts
// the moderator classes does not depend on the other functions
// but now it has access to the other methods

class Moderator extends Post () {

}


// good 

class Post {
  constructor(moderator){
   this.moderator = moderator
  }
  
  editPost(){
    if(this.moderator) {
     console.log('Post edited')
    } else {
     console.log('Post denied')
    }
  }
  
  createPost(){
   console.log('Post created')
  }
  
  deletePost(){
   console.log('Post created')
  }
}