How to do associative array/hashing in JavaScript

Question

I need to store some statistics using JavaScript in a way like I'd do it in C#:

Dictionary<string, int> statistics;  statistics["Foo"] = 10; statistics["Goo"] = statistics["Goo"] + 1; statistics.Add("Zoo", 1); 

Is there an Hashtable or something like Dictionary<TKey, TValue> in JavaScript?
How could I store values in such a way?

Answer 1

Use JavaScript objects as associative arrays.

Associative Array: In simple words associative arrays use Strings instead of Integer numbers as index.

Create an object with

var dictionary = {}; 

JavaScript allows you to add properties to objects by using the following syntax:

Object.yourProperty = value; 

An alternate syntax for the same is:

Object["yourProperty"] = value; 

If you can, also create key-to-value object maps with the following syntax:

var point = { x:3, y:2 };  point["x"] // returns 3 point.y // returns 2 

You can iterate through an associative array using the for..in loop construct as follows

for(var key in Object.keys(dict)){   var value = dict[key];   /* use key/value for intended purpose */ }