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an0/flatMap.md

Created December 5, 2015 03:34
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flatMap
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flatMap.md

box1_of_e1.flatMap(e1 -> box2_of_e2) -> box1_of_e2

  1. Maps every element of the source box to a target box.
  2. If the target box is not empty, unwraps it and puts its content into the source box.
  3. If the target box is empty, ignores it.

So it filters out empty target boxes. But it doesn't filter out empty elements of the source box. The mapping function f must handle empty source elements.

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