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    <p>I've implemented a JavaScript HashMap which code can be obtained from <a href="http://github.com/lambder/HashMapJS/tree/master" rel="nofollow noreferrer">http://github.com/lambder/HashMapJS/tree/master</a></p> <p>Here is the code:</p> <pre><code>/* ===================================================================== @license MIT @author Daniel Kwiecinski &lt;daniel.kwiecinski@lambder.com&gt; @copyright 2009 Daniel Kwiecinski. @end ===================================================================== */ var HashMap = function() { this.initialize(); } HashMap.prototype = { hashkey_prefix: "&lt;#HashMapHashkeyPerfix&gt;", hashcode_field: "&lt;#HashMapHashkeyPerfix&gt;", initialize: function() { this.backing_hash = {}; this.code = 0; }, /* maps value to key returning previous assocciation */ put: function(key, value) { var prev; if (key &amp;&amp; value) { var hashCode = key[this.hashcode_field]; if (hashCode) { prev = this.backing_hash[hashCode]; } else { this.code += 1; hashCode = this.hashkey_prefix + this.code; key[this.hashcode_field] = hashCode; } this.backing_hash[hashCode] = value; } return prev; }, /* returns value associated with given key */ get: function(key) { var value; if (key) { var hashCode = key[this.hashcode_field]; if (hashCode) { value = this.backing_hash[hashCode]; } } return value; }, /* deletes association by given key. Returns true if the assocciation existed, false otherwise */ del: function(key) { var success = false; if (key) { var hashCode = key[this.hashcode_field]; if (hashCode) { var prev = this.backing_hash[hashCode]; this.backing_hash[hashCode] = undefined; if(prev !== undefined) success = true; } } return success; } } //// Usage // creation var my_map = new HashMap(); // insertion var a_key = {}; var a_value = {struct: "structA"}; var b_key = {}; var b_value = {struct: "structB"}; var c_key = {}; var c_value = {struct: "structC"}; my_map.put(a_key, a_value); my_map.put(b_key, b_value); var prev_b = my_map.put(b_key, c_value); // retrieval if(my_map.get(a_key) !== a_value){ throw("fail1") } if(my_map.get(b_key) !== c_value){ throw("fail2") } if(prev_b !== b_value){ throw("fail3") } // deletion var a_existed = my_map.del(a_key); var c_existed = my_map.del(c_key); var a2_existed = my_map.del(a_key); if(a_existed !== true){ throw("fail4") } if(c_existed !== false){ throw("fail5") } if(a2_existed !== false){ throw("fail6") } </code></pre>
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    1. POJavaScript Hashmap Equivalent
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    1. USLambder
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    1. COYou code does not seem to work with putting the same object in multiple `HashMap`s.
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      1. USErik Allik
 

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