mapreduce.go

func mapF(filename string, contents string) []mapreduce.KeyValue {
	tokens := strings.FieldsFunc(contents, func(r rune) bool {
		return !unicode.IsLetter(r)
	})
	kvs := make([]mapreduce.KeyValue, 0)
	for _, val := range tokens {
		kvs = append(kvs, mapreduce.KeyValue{Key: val, Value: "1"})
	}
	return kvs
}

func reduceF(key string, values []string) string {
	var sum int64
	for _, s := range values {
		val, _ := strconv.ParseInt(s, 10, 64)
		sum = sum + val
	}
	return fmt.Sprintf("%d", sum)
}