Product if...

I know I've done this before....I'm just drawing a blank as to how.....
column A is numbers. Column B is "yes" or "no".
I want to multiply all the values in column A that the corresponding column B is "yes". i know there's a "sumif" function if I wanted to add them together, but I need to multiply.

thanks in advance....

Code:

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=PRODUCT((A1:A6)^(--(B1:B6="yes")))

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Enter as an array formula

thank you!
can you explain this formula to me? what does the "--" mean?

See example
You don't really need --; force of habit!

Code:

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=PRODUCT((A1:A6)^(B1:B6="yes"))

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very cool! learned a lot from that example. thank you!