csauve

var TextEncoder = require("text-encoding").TextEncoder;
var TextDecoder = require("text-encoding").TextDecoder;

var jsSource = "";
process.stdin.resume();
process.stdin.on("data", function(buf) {
  jsSource += buf.toString();
});

process.stdin.on("end", function() {

csauve

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 })