Changeset: Move stringAssembler() logic to a new class

Author: rhansen

src/static/js/Changeset.js

@@ -674,14 +674,16 @@ exports.stringIterator = (str) => {
   };
 };
 
+class StringAssembler {
+  constructor() { this._str = ''; }
+  append(x) { this._str += String(x); }
+  toString() { return this._str; }
+}
+
 /**
  * A custom made StringBuffer
  */
-exports.stringAssembler = () => ({
-  _str: '',
-  append(x) { this._str += String(x); },
-  toString() { return this._str; },
-});
+exports.stringAssembler = () => new StringAssembler();
 
 /**
  * Class to iterate and modify texts which have several lines. It is used for applying Changesets on