initial import

example/mapreduce/flatmap/flatmap.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+
+	"zero/core/mapreduce"
+)
+
+var (
+	persons = []string{"john", "mary", "alice", "bob"}
+	friends = map[string][]string{
+		"john":  {"harry", "hermione", "ron"},
+		"mary":  {"sam", "frodo"},
+		"alice": {},
+		"bob":   {"jamie", "tyrion", "cersei"},
+	}
+)
+
+func main() {
+	var allFriends []string
+	for v := range mapreduce.Map(func(source chan<- interface{}) {
+		for _, each := range persons {
+			source <- each
+		}
+	}, func(item interface{}, writer mapreduce.Writer) {
+		writer.Write(friends[item.(string)])
+	}, mapreduce.WithWorkers(100)) {
+		allFriends = append(allFriends, v.([]string)...)
+	}
+	fmt.Println(allFriends)
+}