sequence.sample(number) → selection
stream.sample(number) → array
array.sample(number) → array
Select a given number of elements from a sequence with uniform random distribution. Selection is done without replacement.
If the sequence has less than the requested number of elements (i.e., calling
sample(10) on a sequence with only five elements),
sample will return the entire sequence in a random order.
Example: Select 3 random heroes.
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