var arr = [1,2,3,4,5,6,7,8,9,10 ...];

var obj = {};

{
  0:1,
  1:2,
  2:3,
  3:4,
  4:5,
  5:6,
  6:7,
  7:8,
  8:9,
  9:10,
  ...
  ...
}