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Revising Traversables.scala groupBy example #128

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Revising Traversables.scala groupBy example #128

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ArkadiuszChudoba
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There were two problems with groupBy example:

  1. It didn't work properly for negative numbers.
  2. partial functions were unnecessarily complicated as we could use the fact that we chain partial functions. This has added benefit of showing how partial functions can be chained to perform more specific grouping.

@ArkadiuszChudoba
Fixing Traversables.scala groupBy example
9fa4664 
There were two problems with groupBy example:
1. It didn't work properly for negative numbers.
2. partial functions were unnecessarily complicated as we could use the fact that we chain partial functions.  This has added benefit of showing how partial functions can be chained to perform more specific grouping.
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