> Where are [methods called .lazy(), .concat(), .map(), .filter(), and > .flatMap()] defined? Is it intended that .map() and .flatMap() will > be defined on all iterables?
Just in case it wasn't obvious from the repo, these are defined in traceur.init.js. Lovely style. I have to admit that the sudoku demos were quite an eye opener in terms of just what the features in es6 can do. On the other hand, I agree with others that typical use of array comprehensions are simple and fast (see fast.js) due to not having function call overhead each iteration. I'm concerned that the sexy use of yield and function* may not be as performant as simple comprehensions. -- Owen
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