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

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