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uniq 

        # Array.uniq

(from ruby core)
---
    array.uniq -> new_array
    array.uniq {|element| ... } -> new_array

---

Returns a new Array containing those elements from `self` that are not
duplicates, the first occurrence always being retained.

With no block given, identifies and omits duplicates using method `eql?`
to compare.
    a = [0, 0, 1, 1, 2, 2]
    a.uniq # => [0, 1, 2]

With a block given, calls the block for each element; identifies (using
method `eql?`) and omits duplicate values, that is, those elements for
which the block returns the same value:
    a = ['a', 'aa', 'aaa', 'b', 'bb', 'bbb']
    a.uniq {|element| element.size } # => ["a", "aa", "aaa"]

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