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copied!<p>Here's a quick proof-of-concept...</p> <p>I've hardly tested it at all, and I'm certain that there will be corner-cases that it can't deal with.</p> <p>Performance will be hideously inefficient because the <code>__createHash</code> function needs to recurse through the members of any objects and then sort them, in order to generate a "hash" that meets your requirements.</p> <pre><code>HashMap = function() { this.get = function(key) { var hash = this.__createHash(key); return this.__map[hash]; }; this.set = function(key, value) { var hash = this.__createHash(key); this.__map[hash] = value; }; this.__createHash = function(key) { switch (typeof key) { case 'function': return 'function'; case 'undefined': return 'undefined'; case 'string': return '"' + key.replace('"', '""') + '"'; case 'object': if (!key) { return 'null'; } switch (Object.prototype.toString.apply(key)) { case '[object Array]': var elements = []; for (var i = 0; i < key.length; i++) { elements.push(this.__createHash(key[i])); } return '[' + elements.join(',') + ']'; case '[object Date]': return '#' + key.getUTCFullYear().toString() + (key.getUTCMonth() + 1).toString() + key.getUTCDate().toString() + key.getUTCHours().toString() + key.getUTCMinutes().toString() + key.getUTCSeconds().toString() + '#'; default: var members = []; for (var m in key) { members.push(m + '=' + this.__createHash(key[m])); } members.sort(); return '{' + members.join(',') + '}'; } default: return key.toString(); } }; this.__map = {}; } </code></pre>

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