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    <p>Well though it seemed to be a common problem, and I found what seemed to be <a href="https://github.com/thegoldenmule/JSSet" rel="nofollow">a good Set class on the net</a> that supports objects, I wanted a simpler one and ended up writing one myself... in case anyone else finds it useful...</p> <pre><code>/** * A Javascript Class that represents a set of unique values * * Usage: * * var s = new jsSet(); * * s.add('a1'); s.add('a2'); * * s.list(); &gt;&gt; ['a1','a2'] * * s.remove('a1'); s.list(); &gt;&gt; ['a2'] * * s.contains('a1') &gt;&gt; false * * s.contains('a2') &gt;&gt; true * * can be chained * s.add(null).add('hello'); * * add array * s.addAll([ null, 'a', 'b' ]); * * remove array * s.addAll([ null, 'a', 'b' ]); * * retrieve the elements as a list * s.list(); * * size of the set * s.size(); * */ function jsSet() { // null can also be an element of the set, but needs // a separate indication to differentiate it from // the string "null" as well this.isNullAdded = false; // private member variable hence no 'this' var map = {}; // Scope for optimization // could be cached instead of generating each time // this.uniqueList = []; // returns true if the element is in this set, false otherwise this.contains = function(key) { if (key === null) return this.isNullAdded; else if (key === undefined) return false; else return map[key] ? true : false; }; // adds the element to the set this.add = function(val) { if (val === null) this.isNullAdded = true; else if (val !== undefined) map[val] = true; return this; }; // adds all the elements of the array to the set this.addAll = function(val) { if (val !== null &amp;&amp; val !== undefined &amp;&amp; val instanceof Array) { for ( var idx = 0; idx &lt; val.length; idx++) { this.add(val[idx]); } } return this; }; // removes the specified element from the set this.remove = function(val) { if (val === null) this.isNullAdded = false; else if (val !== undefined) delete map[val]; return this; }; // removes all the element in the array from the set this.removeAll = function(val) { if (val !== null &amp;&amp; val !== undefined &amp;&amp; val instanceof Array) { for ( var idx = 0; idx &lt; val.length; idx++) { console.log('val: %s:%s', idx, val[idx]); this.remove(val[idx]); } } return this; }; // empties the set of all values this.clear = function() { this.isNullAdded = false; map = {}; return this; }; // returns the number of elements in the set this.size = function() { return this.list().length; }; // returns true if the set is empty, false otherwise this.isEmpty = function() { return this.list().length &gt; 0? false: true; }; // returns the elements of the set as a list this.list = function() { var arr = []; if (this.isNullAdded) arr.push(null); for (o in map) { // protect from inherited properties such as // Object.prototype.test = 'inherited property'; if (map.hasOwnProperty(o)) arr.push(o); } return arr; }; }; </code></pre>
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    1. POSet data structure of Java in javascript/jQuery
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    1. COif we don't need null values in the Set, then we can just do a remove(null) after adding all elements.
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