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hi Iamp;#39;m Nikita Baker and welcome to a series about goes interfaces today we are going to talk about the flag package and the value interface inside of it so the flag package provides several built-in functions for supporting integer strings booleans Etc but sometimes you want to have your own type for that the flag package defines a value interface and if you think about a generic something that you need to set or display from the command line this is what you need you need a string to show the current value and you need a way to tell this value to set itself from another string command line is always strings and maybe display an error if something is not valid so letamp;#39;s say that I want to validate addresses that sent to a server these addresses to listen on have an interface which might be empty a colon and then a port number so Iamp;#39;m defining an other value letamp;#39;s have a look at what it is so hereamp;#39;s the other vowel itamp;#39;s struct and it
