How to use

_allRegisteredProperties

function

in

Array

/**
  * Returns a list containing the property names assigned to the input
  *
  * @return {Array<string>}
  */
 propertyNames(){
  return [...new Set([...this[_properties].keys(),
   ...Input._allRegisteredProperties(this.constructor).keys(),
  ])];
 }

/**
  * Returns the property value for the input property name
  *
  * @param {string} name - name of the property
  * @return {Promise<*>} The value of the property otherwise raises an exception
  * in case the property is not assigned
  */
 property(name){
  assert(TypeCheck.isString(name), 'property name needs to be defined as string');

  if (this[_properties].has(name)){
   return this[_properties].get(name);
  }

  // checking if the property is valid
  const allRegisteredProperties = Input._allRegisteredProperties(this.constructor);
  if (allRegisteredProperties.has(name)){
   return allRegisteredProperties.get(name);
  }

  throw new Error(`Property ${name} is not registered!`);
 }

/**
  * Returns a boolean telling if the input property name is assigned to the input
  *
  * @param {string} name - name of the property
  * @return {boolean}
  */
 hasProperty(name){
  assert(TypeCheck.isString(name), 'property name needs to be defined as string');

  return Input._allRegisteredProperties(this.constructor).has(name) || this[_properties].has(name);
 }

if (!loose && !Input._allRegisteredProperties(this.constructor).has(name)){
 throw new Error(`Property ${name} is not registered!`);