gistfile1.js

var roid, roid2, _i, _j, _len, _len2;
for (_i = 0, _len = asteroids.length; _i < _len; _i++) {
  roid = asteroids[_i];
  for (_j = 0, _len2 = asteroids.length; _j < _len2; _j++) {
    roid2 = asteroids[_j];
    if (roid !== roid2) {
      if (roid.overlaps(roid2)) {
        roid.explode();
      }
    }
  }
}