Example of producer consumer concurrency pattern in Go

producer_consumer.go

package main

import (
	"fmt"
	"strings"
)

var users = map[int]string{
	1: "Rob",
	2: "Ken",
	3: "Robert",
}

func Search(substring string) <-chan string {
	c := make(chan string)
	go func() {
		defer close(c)
		for _, name := range users {
			if ok := strings.Contains(name, substring); !ok {
				continue
			}
			c <- name
		}
	}()
	return c
}

func main() {
	for name := range Search("Rob") {
		fmt.Println(name)
	}
}