Just in case you were wondering, our fabulous new Set abstraction in JS doesn't have union or intersection http://www.2ality.com/2015/01/es6-set-operations.html …
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map must preserve structure. Consider Set(['a', 'b', 'c']).map(x => x.length) // Set(1)
map only needs to preserve identity and composition. Consider ((->) t) with no length or structure, yet has map.
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I can pronounce those characters individually, but I don't understand ((->) t). Can you point me somewhere?
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map has this type right? (a -> b) -> f a -> f b
End of conversation
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