Environment variables in Go

Here's an example how you can manage environment variables. To assign a value to a key, utilize os.Setenv. Retrieve a value by key using os.Getenv, which will yield an empty string if the key isn't found. Use os.Environ to list all key/value pairs, returned as a string slice formatted as KEY=value. You can split these strings using strings.SplitN to separate keys and values.