Meaning of いいとも in Japanese

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Definition of いいとも

いいとも(iitomo)

Of course you can trust me. Have I ever given you a bum steer before?

いいとも、それはいい考えかんがえだ。

Sure. That's a good idea.

「車くるまを借りていいかい」「いいとも、どうぞ」

"Can I use your car?" "Sure. Go ahead."

「一緒にいっしょにいいかい」「もちろんいいとも」

"May I join you?" "Why not?"