やるじゃないか

expression

not bad; pretty good; you're pretty good

Casual expression of mild surprise or admiration when someone does something better than expected. Often used when praising a peer or someone of equal or lower status.

• お、やるじゃないか。意い外がいと上手じょうずだね。

  Oh, not bad! You're surprisingly good at this.

• 初はじめてなのに、やるじゃないか。

  For a first-timer, you're pretty good.