Created
December 8, 2014 22:10
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Simple map-reduce in Groovy
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| def mapReduce = { collection, mapper, reducer -> | |
| collection.groupBy(mapper) | |
| .collectEntries { k, v -> | |
| [k, reducer(v)] | |
| } | |
| } | |
| mapReduce([1, 6, 3, 7, 3, 9, 1, 2, 10, 9, 5, 8, 4], | |
| { it % 2 ? "odd" : "even" }, | |
| { it.size }) | |
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