Example of using goroutines to run code concurrently

search.go

package search

import (
	"fmt"
	"time"
)

// Search performs a search
func Search(term string) string {

	c := make(chan []string)

	go func() {
		c <- searchA()
	}()
	go func() {
		c <- searchB()
	}()

	go func() {
		c <- searchC()
	}()

	resultCount := 0

	for i := resultCount; i < 3; i++ {
		res := <-c
		resultCount = resultCount + len(res)
	}

	/*
		resultCount := 0

		rA := searchA()
		rB := searchB()
		rC := searchC()

		resultCount = len(rA) + len(rB) + len(rC)
	*/

	return fmt.Sprintf("Total results: %v", resultCount)
}

func searchA() []string {
	// call to external API
	time.Sleep(time.Duration(3000 * time.Millisecond))
	result := make([]string, 1)
	return result
}

func searchB() []string {
	// call to external API
	time.Sleep(time.Duration(3000 * time.Millisecond))
	result := make([]string, 1)
	return result
}

func searchC() []string {
	// call to external API
	time.Sleep(time.Duration(3000 * time.Millisecond))
	result := make([]string, 1)
	return result
}