Why are NoSQL solutions using Javascript these days for their "SQL"? [closed]

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What were the trade offs? Why was js chosen?

Why not another scripting language like Ruby?

MongoDB and Riak both use JS. A lot of other ones are using JS too. Is this just a "follow the crowd" thing?

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NoSql document structure is very similar to json. And json is based on a subset of the JavaScript Programming Language Standard. So javascript can manipulate json easily, thus can manipulate nosql document easily. So javascript is used in nosql solutions. That's my understanding.

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Makes it quite convenient for calling from Javascript in dynamic web pages.