Interview Golang: Passing data that is coming from go routines to main method

set_1.go

Questions: https://docs.google.com/document/d/1R_mOM1W_v-yNxRW30Yfx_pILPjAuTUWp/edit?usp=drive_link&ouid=112036395083803415170&rtpof=true&sd=true

// Below Program is for Question 1- Variant 1
package main

import (
	"fmt"
	"net/http"
	"sync"
)

// Please update the code as per the requirement
func main() {
	var wg sync.WaitGroup
	wg.Add(10)
	for i := 0; i < 10; i++ {
		go makeRequest(i, &wg)
	}
	wg.Wait()
}

func makeRequest(userID int, wg *sync.WaitGroup) {
	defer wg.Done()
	params := fmt.Sprintf("?user_id=%d", userID)
	resp, err := fakeRequest("https://example.com" + params)

	if err != nil {
		fmt.Println("Error:", err)
	}

	if resp == nil {
		fmt.Println("Response is nil")
		return
	}

	fmt.Println("Response status:", resp.StatusCode)
}

func fakeRequest(_ string) (*http.Response, error) {
	return &http.Response{
		StatusCode: 200,
	}, nil
}


// Below Program is for Question 2

package main

import (
	"fmt"
	"net/http"
	"sync"
)

// Please update the code as per the requirement
func main() {
	responses := make([]int, 10)
	ch := make(chan int, 10)
	var mu sync.Mutex

	for i := 0; i < 10; i++ {
		go makeRequest(i, ch, responses, &mu)
	}

	for value := range ch {
		fmt.Println(value)
	}

	for value := range responses {
		fmt.Println("Response = ", value)
	}

	fmt.Println("Response at index = 5 is:", responses[5])
}

func makeRequest(userID int, ch chan int, responses []int, mu *sync.Mutex) {
	params := fmt.Sprintf("?user_id=%d", userID)
	resp, err := fakeRequest("https://example.com" + params)

	if err != nil {
		fmt.Println("Error:", err)
	}

	if resp == nil {
		fmt.Println("Response is nil")
		return
	}

	mu.Lock()
	responses[userID] = resp.StatusCode
	mu.Unlock()

	ch <- resp.StatusCode

	fmt.Println("Response status:", resp.StatusCode)
}

func fakeRequest(_ string) (*http.Response, error) {
	return &http.Response{
		StatusCode: 200,
	}, nil
}