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values_at 

        # Array.values_at

(from ruby core)
---
    array.values_at(*indexes) -> new_array

---

Returns a new Array whose elements are the elements of `self` at the
given Integer or Range `indexes`.

For each positive `index`, returns the element at offset `index`:
    a = [:foo, 'bar', 2]
    a.values_at(0, 2) # => [:foo, 2]
    a.values_at(0..1) # => [:foo, "bar"]

The given `indexes` may be in any order, and may repeat:
    a = [:foo, 'bar', 2]
    a.values_at(2, 0, 1, 0, 2) # => [2, :foo, "bar", :foo, 2]
    a.values_at(1, 0..2) # => ["bar", :foo, "bar", 2]

Assigns `nil` for an `index` that is too large:
    a = [:foo, 'bar', 2]
    a.values_at(0, 3, 1, 3) # => [:foo, nil, "bar", nil]

Returns a new empty Array if no arguments given.

For each negative `index`, counts backward from the end of the array:
    a = [:foo, 'bar', 2]
    a.values_at(-1, -3) # => [2, :foo]

Assigns `nil` for an `index` that is too small:
    a = [:foo, 'bar', 2]
    a.values_at(0, -5, 1, -6, 2) # => [:foo, nil, "bar", nil, 2]

The given `indexes` may have a mixture of signs:
    a = [:foo, 'bar', 2]
    a.values_at(0, -2, 1, -1) # => [:foo, "bar", "bar", 2]

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