Destructuring.Assignment.js

We can extract these values by index in ES5:

var
  one   = myArray[0],
  two   = myArray[1],
  three = myArray[2];

// one = 'a', two = 'b', three = 'c'
ES6 destructuring permits a simpler and less error-prone alternative:

var [one, two, three] = myArray;

// one = 'a', two = 'b', three = 'c'

or use the spread operator (...) to extract remaining elements:

var [one, ...two] = myArray;

// one = 'a', two = ['b, 'c']


from: https://www.sitepoint.com/preparing-ecmascript-6-destructuring-assignment/