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fetch_values 

        # Hash.fetch_values

(from ruby core)
---
    hash.fetch_values(*keys) -> new_array
    hash.fetch_values(*keys) {|key| ... } -> new_array

---

Returns a new Array containing the values associated with the given keys
*keys:
    h = {foo: 0, bar: 1, baz: 2}
    h.fetch_values(:baz, :foo) # => [2, 0]

Returns a new empty Array if no arguments given.

When a block is given, calls the block with each missing key, treating
the block's return value as the value for that key:
    h = {foo: 0, bar: 1, baz: 2}
    values = h.fetch_values(:bar, :foo, :bad, :bam) {|key| key.to_s}
    values # => [1, 0, "bad", "bam"]

When no block is given, raises an exception if any given key is not
found.

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