How to implement flag toggles and switches in Go?

In Go, there are several ways to implement flag toggles and switches. Here are two commonly used methods:

Using the built-in flag package: The flag package in Go provides a simple and convenient way to define command-line flags. You can use it to define boolean flags and then read their values to toggle or switch functionalities based on the flag values.

Here's an example code:

package main

import "flag"
import "fmt"

func main() {
    // Define flags
    enableFeature := flag.Bool("feature", false, "Enable feature")
    debugMode := flag.Bool("debug", false, "Enable debug mode")

    // Parse flags
    flag.Parse()

    // Use the flag values to toggle or switch functionalities
    if *enableFeature {
        fmt.Println("Feature is enabled")
    }

    if *debugMode {
        fmt.Println("Debug mode is enabled")
    }
}

You can run the program and pass the flags as command-line arguments to toggle or switch the functionalities. For example:

go run main.go -feature -debug

This will enable both the feature and debug functionalities.

Using environment variables: Another approach is to use environment variables to toggle or switch functionalities. You can set environment variables in your shell or in your application before running it, and then read their values to determine the state of the functionality.

Here's an example code:

package main

import "os"
import "fmt"

func main() {
    // Read environment variables
    enableFeature := os.Getenv("ENABLE_FEATURE") == "true"
    debugMode := os.Getenv("DEBUG_MODE") == "true"

    // Use the environment variable values to toggle or switch functionalities
    if enableFeature {
        fmt.Println("Feature is enabled")
    }

    if debugMode {
        fmt.Println("Debug mode is enabled")
    }
}

You can set environment variables before running the program to toggle or switch the functionalities. For example:

ENABLE_FEATURE=true DEBUG_MODE=true go run main.go

This will enable both the feature and debug functionalities.

Both methods provide different ways to toggle or switch functionalities in Go, and you can choose the one that fits your needs.