Learning ES6 learing es6 and recording some useful practice. let & const destructuring module string http://software-download.microsoft.com/pr/Win10_1511_1_Chinese(Simplified)_x64.iso?t=0f962d3a-4282-418c-b62e-cb8b13e0a4a8&e=1460902547&h=50c2de8f02abfd9e1229efba5b8bb707