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minmax 

        # Array.minmax

(from ruby core)
---
    array.minmax -> [min_val, max_val]
    array.minmax {|a, b| ... } -> [min_val, max_val]

---

Returns a new 2-element Array containing the minimum and maximum values
from `self`, either per method `<=>` or per a given block:.

When no block is given, each element in `self` must respond to method
`<=>` with an Integer; returns a new 2-element Array containing the
minimum and maximum values from `self`, per method `<=>`:
    [0, 1, 2].minmax # => [0, 2]

When a block is given, the block must return an Integer; the block is
called `self.size-1` times to compare elements; returns a new 2-element
Array containing the minimum and maximum values from `self`, per the
block:
    ['0', '00', '000'].minmax {|a, b| a.size <=> b.size } # => ["0", "000"]

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