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each_grapheme_cluster 

        # String.each_grapheme_cluster

(from ruby core)
---
    str.each_grapheme_cluster {|cstr| block }    -> str
    str.each_grapheme_cluster                    -> an_enumerator

---

Passes each grapheme cluster in *str* to the given block, or returns an
enumerator if no block is given. Unlike String#each_char, this
enumerates by grapheme clusters defined by Unicode Standard Annex #29
http://unicode.org/reports/tr29/

    "a\u0300".each_char.to_a.size #=> 2
    "a\u0300".each_grapheme_cluster.to_a.size #=> 1

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