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setjs - Set data structure for JavaScript

setjs implements a a Set API inspired by Python. There are some differences, though. The biggest difference is that the API is immutable by design. There is a basic set structure and functions that operate upon it. Consider the API below:

var a = set(4, 3, 4, 3); // set accepts arbitrary amount of items and may be empty 
var b = set(4, 5);
set.count(a); // 2 
set.contains(a, 3); // true 
set.equals(a, a); // true 
set.equals(a, set()); // false 
set.union(a, b); // {3, 4, 5} 
set.intersection(a, b); // {4} 
set.difference(a, b); // {5} 
set.symmetricDifference(a, b); // {3, 5} 

The functions above may be used to perform various manipulations on sets.