I was asking some people "Do you know if a #rand method exists on an
array object"? Unanimously, I got a "yup" response back. Actually it's
called #sample.

http://www.ruby-doc.org/core-1.9.2/Array.html#method-i-sample

Seems like rand doesn't exist on Array.

I know there are ways around to define an alias for #rand on Array, but
am just curious; Why isn't it named #rand in ruby core? And if there's
no reason, why not add it?

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