main.js
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const cat = {  
  sound: 'meow',
  legs: 4
};

const dog = {  
  ...cat,
  ...{
    sound: 'woof' // <----- Overwrites cat.sound
  }
};
console.log(dog); // => { sound: 'woof', legs: 4 } 
Babel Compiler v6.4.4 Copyright (c) 2014-2015 Sebastian McKenzie