Axel Rauschmayer (2014-10-01T20:17:12.000Z)
forbes at lindesay.co.uk (2016-02-01T12:29:45.348Z)
Almost. Correct versions: ```js let map2 = new Map(map1.entries().filter(([key, value]) => key >= 0)); let map2 = new Map(map1.entries().map(([key, value]) => [key * 2, value * 2])); ```