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var s="foo";
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s.append("bar"); //-->new string "foobar", var s unchanged
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s+="bar"; //-->new string "foobar", var s modifed to new value
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s=Data(Void,"foo"); // byte blob/character blob/text editor buffer
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s.append("bar"); // or s+="bar"
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s.text; //-->"foobar"
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