Set data structure of Java in javascript/jQuery -

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What is a way to create a Java-like data structure (unique archive) in JavaScript?

For a set of strings, I only use one object with the value. 

  var obj = {}; Obj ["foo"] = true; Obj ["bar"] = true; How it basically works in Java, assuming that the Javascript object is implemented as a hashtable (which is normal) [/ s].

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