These are four questions and I'm sure that each one of these is already answered.
– TusharMar 18 '16 at 15:24
1
Check this question: http://stackoverflow.com/questions/36062613/adding-empty-array-with-empty-object-yields-different-results-when-flipping-oper/36062842#36062842
– Dmitri PavlutinMar 18 '16 at 15:26