How to convert interface{} to string?

Question

I\'m using docopt to parse command-line arguments. This works, and it results in a map, such as

map[:www.google.de :80 --help:false --ver         


        

Answer 1

You need to add type assertion .(string). It is necessary because the map is of type map[string]interface{}:

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

Latest version of Docopt returns Opts object that has methods for conversion:

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