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Calls the given block with each successive grapheme cluster from +self+
(see {Unicode Grapheme Cluster Boundaries}[https://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries]);
returns +self+:
s = "\u0061\u0308-pqr-\u0062\u0308-xyz-\u0063\u0308" # => "ä-pqr-b̈-xyz-c̈"
s.each_grapheme_cluster {|gc| print gc, ' ' }
Output:
ä - p q r - b̈ - x y z - c̈
Returns an enumerator if no block is given.
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