Basing my answer off of this:
if I call
myarray.mysample(1.5)
10 times, the number of elements I get should be close to 15.
Extending Array
yields the following:
class Array
def mysample(num)
self.sample( ( num + rand() ).floor )
end
end
> [1, 2, 3, 4, 5].mysample(2.5)
=> [1, 3]
> [1, 2, 3, 4, 5].mysample(2.5)
=> [4, 2, 5]
> [1, 2, 3, 4, 5].mysample(0.5)
=> []
> [1, 2, 3, 4, 5].mysample(0.5)
=> [3]
etc.