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> HashSets, HashMaps, TreeMaps etc.

As a note, the built-in JS object type is a hash map; although it has the annoying property of requiring keys to be strings, it still suffices for most uses of maps and sets.




Indeed. See also JSON.

ES6 brings Map, Set, WeakMap, and WeakSet. First three are already prototyped in Firefox and (under a flag) Chrome.

/be




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