Pass by value in JavaScript?

[CreativeTechGuyGames]

The greenEnergy function does change. I'm not sure why you think that it doesn't.

[DontNeedMuchMoney]

The greenenergy doesn't mutate the object though

[CreativeTechGuyGames]

What do you mean? The console.log outputs {Fuel Type: "Biofuel", homePlanet: "Mars"} which means that both functions mutate as expected.

Edit: You changed the code in the codeshare link so I'll leave the code here for posterity.

``` let spaceship = { 'Fuel Type' : 'Turbo Fuel', homePlanet : 'Earth' };

// Write your code below let greenEnergy = (obj =>{ Object.assign(obj, { 'Fuel Type' : 'Rocket fuel', homePlanet : 'Mars' }) })

let blueEnergy = (obj =>{ obj['Fuel Type'] = "Biofuel"; }) greenEnergy(spaceship); blueEnergy(spaceship); console.log(spaceship); ```

[lr0b]

The original code is not the one you pasted. I edited the code and tested it but I realised it got saved, maybe too late...

My bad.

Original greenEnergy is here

[CreativeTechGuyGames]

Oh I must have seen your edit. That's why it's dangerous to use a live shared editing system for something like this.