pass-by-reference.js

//Objects are passed by reference. 
//This means when we pass a variable assigned to an object 
//into a function as an argument, the computer interprets the parameter 
//name as pointing to the space in memory holding that object. As a result, 
//functions which change object properties actually mutate the 
//object permanently (even when the object is assigned to a const variable).

const spaceship = {
    homePlanet : 'Earth',
    color : 'silver'
  };
   
  let paintIt = obj => {
    obj.color = 'glorious gold'
  };
   
  paintIt(spaceship);
   
  spaceship.color // Returns 'glorious gold'


  // 
  let spaceship = {
    homePlanet : 'Earth',
    color : 'red'
  };
  let tryReassignment = obj => {
    obj = {
      identified : false, 
      'transport type' : 'flying'
    }
    console.log(obj) // Prints {'identified': false, 'transport type': 'flying'}
   
  };
  tryReassignment(spaceship) // The attempt at reassignment does not work.
  spaceship // Still returns {homePlanet : 'Earth', color : 'red'};
   
  spaceship = {
    identified : false, 
    'transport type': 'flying'
  }; // Regular reassignment still works.


  // Another Example
  let spaceship = {
    'Fuel Type' : 'Turbo Fuel',
    homePlanet : 'Earth'
  };
  
  // Write your code below.
  let greenEnergy=obj=>{
    obj['Fuel Type']='avocado oil';
  };
  
  let remotelyDisable=obj=>{
    obj.disabled=true;
  };
  
  greenEnergy(spaceship);
  remotelyDisable(spaceship);
  
  console.log(spaceship);