How to Safely Convert `interface{}` to `string` in Go When Using docopt?

Conversion of interface{} to String in Go

When using docopt to parse command-line arguments, the result is a map of type map[string]interface{}. However, when attempting to concatenate values from this map, an error may occur due to type mismatch. This is because the map's values are of type interface{}, which can be anything. To resolve this issue, type assertion is required.

To convert an interface{} value to a string, use the .(string) operator. This operator asserts that the value can be cast to a string. For example:

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

In this example, the values for "host" and "port" are obtained from the arguments map, and then converted to strings using the .(string) operator.

Latest versions of docopt provide an Opts object with methods for type conversion. These methods can be used as follows:

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

The String() method converts the value to a string, simplifying the type conversion process.

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