promisecopy_1.js

const states = {
  pending: 'PENDING',
  fulfilled: 'FULFILLED',
  rejected: 'REJECTED'
}
class PromiseCopy{
  #state = states.pending // initial state of promise
  #result = undefined ; 
  
   constructor( executor ){
    
     try{
        executor( PromiseCopy.resolve.bind( this ), PromiseCopy.reject.bind( this ) )
     }
     catch( e ){
        PromiseCopy.reject.call( this, e ) ; // reject promise when error thrown.
     }
    
   }
  
  static resolve(){ /**/ }
  static reject(){ /**/ }
}