Communed with them, i.e. to try their proficiency: this argues the king's ability and judgment, how else could he discern their fitness and their excellency above others? He examined all candidates, he preferred those that outstripped others.
Related Commentaries of Daniel 1:19
Daniel 1:19
19 And the king communed with them; and among them all was found none like Daniel, Hananiah, Mishael, and Azariah: therefore stood they before the king.