How to Safely Convert `interface{}` to `string` in Go's docopt?

Converting Interface{} to String in Go

When using docopt to parse command-line arguments, you may encounter a situation where you need to concatenate string values from a map containing interface{} values. However, attempting to concatenate an interface{} directly with a string will result in a type mismatch error.

To resolve this issue, type assertion is required to convert the interface{} values to strings. In the provided example:

arguments["<host>"].(string) + ":" + arguments["<port>"].(string)

The .(string) assertion asserts that the interface{} stored in arguments[""] and arguments[""] can be converted to a string. it is important because the map is of type map[string]interface{}.

In newer versions of docopt, you can also use dedicated conversion methods:

host, err := arguments.String("<host>")
port, err := arguments.String("<port>")
host_port := host + ":" + port

By using these methods, you can easily convert interface{} values to strings within the docopt context, allowing you to manipulate and concatenate them as needed.

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