Common concurrency patterns in Go - Mini Project: Build & Apply

Common concurrency patterns

📖 Scenario: You are building a simple program in Go to understand how concurrency works. You will create a program that runs multiple tasks at the same time and collects their results.

🎯 Goal: Build a Go program that launches multiple concurrent tasks using goroutines, collects their results via channels, and prints the combined output.

📋 What You'll Learn

Create a slice of strings representing tasks

Create a channel to collect results

Launch a goroutine for each task that sends a message to the channel

Collect all messages from the channel and print them

💡 Why This Matters

🌍 Real World

Concurrency is used in real-world programs to run multiple tasks at the same time, like handling many users on a website or processing files in parallel.

💼 Career

Understanding concurrency patterns in Go is important for backend developers, cloud engineers, and anyone building fast, scalable applications.

1

Create a slice of tasks

Create a slice of strings called tasks with these exact values: "task1", "task2", "task3".

Go

# Create a slice of tasks
# Your code here

Hint

Use []string{} to create a slice with the given strings.

2

Create a channel to collect results

Add a channel called results of type chan string to collect results from goroutines.

Go

package main

func main() {
    tasks := []string{"task1", "task2", "task3"}
    // Create a channel to collect results
    // Your code here
}

Hint

Use make(chan string) to create a channel for strings.

3

Launch goroutines to send results

Use a for loop with variable task to iterate over tasks. Inside the loop, launch a goroutine that sends the string "Completed " + task to the results channel.

Go

package main

func main() {
    tasks := []string{"task1", "task2", "task3"}
    results := make(chan string)
    // Launch goroutines to send results
    // Your code here
}

Hint

Use a goroutine with a function literal to send the message to the channel.

4

Collect and print all results

Use a for loop to receive exactly 3 messages from the results channel and print each message using println.

Go

package main

func main() {
    tasks := []string{"task1", "task2", "task3"}
    results := make(chan string)

    for _, task := range tasks {
        go func(t string) {
            results <- "Completed " + t
        }(task)
    }

    // Collect and print results
    // Your code here
}

Hint

Use a loop to receive from the channel exactly three times and print each message.