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rthbound/gist:224b795040ae2dcb593a

Created August 17, 2015 19:49
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gistfile1.txt
def lookup(x); { a: 1, b: 2, c: 3 }[x]; end
def promos; { x: :a, y: :b, z: :c }; end
@promo_counts = Concurrent::Promise.fulfill(@promos = promos).then { |val| Concurrent::Promise.zip(*val.map { |x,v| Concurrent::Promise.new { { x => lookup(v) } } }).value }.value
#=> [{:x=>1}, {:y=>2}, {:z=>3}]
@promos
#=> {:x=>:a, :y=>:b, :z=>:c}
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