Go Code Example

Back to: Golang

Code example that demonstrates the use of several important features of Go:

package main

import "fmt"

type Person struct {
    Name string
    Age  int
}

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

func main() {
    // Declare and initialize a slice of Persons
    persons := []Person{
        {Name: "Alice", Age: 25},
        {Name: "Bob", Age: 30},
        {Name: "Charlie", Age: 35},
    }

    // Iterate over the slice and call the greet method on each Person
    for _, person := range persons {
        person.greet()
    }

    // Declare and initialize a map of Persons
    people := map[string]Person{
        "Alice":   {Name: "Alice", Age: 25},
        "Bob":     {Name: "Bob", Age: 30},
        "Charlie": {Name: "Charlie", Age: 35},
    }

    // Iterate over the map and call the greet method on each Person
    for _, person := range people {
        person.greet()
    }

    // Declare and initialize a channel of type string
    ch := make(chan string)

    // Start a goroutine to send messages to the channel
    go func() {
        ch <- "Hello"
        ch <- "World"
        close(ch)
    }()

    // Read messages from the channel until it's closed
    for message := range ch {
        fmt.Println(message)
    }
}

This code demonstrates the following features of Go:

• Structs and methods: the Person struct and greet method demonstrate how to define a struct and methods on it.
• Slices: the persons slice demonstrates how to declare and initialize a slice of a custom type.
• Maps: the people map demonstrates how to declare and initialize a map of a custom type.
• Channels: the ch channel demonstrates how to declare and initialize a channel, and the goroutine that sends messages to it demonstrates how to start a new concurrent execution flow.
• Goroutines and concurrency: the goroutine that sends messages to the channel demonstrates how to start a new concurrent execution flow, and the loop that reads messages from the channel demonstrates how to synchronize with that flow using a channel.

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