[1,2,3].map(User)
[1, 2, 3].map(id => User(id))
[1,2,3].map(unary(User)) [[1,2],[3,4],[5,6]].map(apply(User))
[1,2,3].map( function(i) { return new User(i); } );
raganwald books cover this way of using javascript https://leanpub.com/u/raganwald
