Go

Hello World & Concurrency Example

// Hello World
package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

// Basic Struct and Methods
package main

import "fmt"

type Person struct {
    Name string
    Age  int
}

func (p Person) Introduce() {
    fmt.Printf("Hi, I'm %s and I'm %d years old.\n", p.Name, p.Age)
}

func main() {
    person := Person{Name: "Alice", Age: 25}
    person.Introduce()
}

// Concurrency with Goroutines
package main

import (
    "fmt"
    "time"
)

func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Printf("Worker %d processing job %d\n", id, j)
        time.Sleep(time.Second) // Simulate work
        results <- j * 2
    }
}

func main() {
    jobs := make(chan int, 100)
    results := make(chan int, 100)

    // Start 3 workers
    for w := 1; w <= 3; w++ {
        go worker(w, jobs, results)
    }

    // Send 5 jobs
    for j := 1; j <= 5; j++ {
        jobs <- j
    }
    close(jobs)

    // Collect results
    for a := 1; a <= 5; a++ {
        <-results
    }
}