Flowdock
method

flat_map

Importance_2
v1_9_2_180 - Show latest stable - 1 note - Class: Enumerable
flat_map() public

Returns a new array with the concatenated results of running block once for every element in enum.

If no block is given, an enumerator is returned instead.

[[1,2],[3,4]].flat_map {|i| i }   #=> [1, 2, 3, 4]
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November 16, 2011
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Alternative definition

a.flat_map(&b) works exactly like a.map(&b).flatten!(1).