JavaScript Map object implementation

The idea of this object is to mimic the API of the Map object in Java.

It can be used in the following way:

var myMap = new Map();
myMap.put('foo', 'bar');
var bar = myMap.get('foo');

I know this behaviour can also be attained by using an array in the following manner:

var myMap = [];
myMap['foo'] = 'bar';
var bar = myMap['foo'];

But I thought it interesting to implement it as a map too.

The code can be found on github here

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