As made clear in update 3 on this answer, this notation:  var hash = {}; hash[X]   does not actually hash the object X; it actually just converts X to a string (via .toString() if it's an object, or some other built-in conversions for various p...
Use Case  The use case is to convert an array of objects into a hash map based on string or function provided to evaluate and use as key in hashmap and value as object itself. Common case of using this is converting an array of objects into a hash ma...
I'm building a server using Node.js. I store the objects representing my users in an associative array and right now the index of those objects are the sockets id of that connection. Using the Socket.io library i obtain it by simply doing socket....
I currently work with OpenLayers and have a huge set of data to draw into a vector layer (greater than 100000 vectors).  I'm now trying to put all these vectors into a JavaScript hash map to analyze the performance.  I want to know how is the has...
In JavaScript, all Objects act a bit like hashmaps.  However, the keys to these hashmaps must be strings.  If they're not, they're converted with toString().  That means:  var a = {foo: 1}; var b = {bar: 2}; var o = {}; o[a] = 100; o[b];...
I have an enum:  var a = {X: 0, Y: 1};   And, I want to create another enum from the values of the first one.  Something like this:  var b = {a.X: "foo", a.Y: "bar"};   Doing this gives me a SyntaxError: Unexpected token .  Is there a...
c =      {             "UNKNOWN_ERR" : 0,             "INDEX_SIZE_ERR" : 1,             "DOMSTRING_SIZE_ERR" : 2,             "HIERARCHY_REQUEST_ERR" : 3,             "WRONG_DOCUMENT_ERR" : 4,             "...
I am considering using JavaScript object as a dictionary.      var dict = {}     dict['a'] = 1;     dict['b'] = 2;      var my_first = dict['a'];   I am not clear about the time-complexity of such implementation. Is it like ha...
I created a simplehashmap using the accepted solution in this question: How to create a simple map using JavaScript/JQuery  I however need to send this var to a servlet and retrieve them onto a Java HashMap. How do I do that.  The key is a string whi...
My requirement is to store key-value pairs in a data structure and fetch or delete the pairs when necessary using keys in JavaScript.  How can I do it in JavaScript as one does it in Java?  I have seen an answer creating an instance of hash map like:...

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