How to Initialize array of structs in Go?

Question

I'm newbie in Go. This issue is driving me nuts. How do you init array of structs in Go ?
type opt struct {
    shortnm      char
    longnm, help string
    needArg      bool
}

const basename_opts []opt { 
        opt {
            shortnm: 'a', 
            longnm: "multiple", 
            needArg: false, 
            help: "Usage for a"}
        },
        opt {
            shortnm: 'b', 
            longnm: "b-option", 
            needArg: false, 
            help: "Usage for b"}
}

The compiler said it expecting ';' after []opt. Where should I put the braces '{' to init my array of struct ?

Gopher · Accepted Answer

It looks like you are trying to use (almost) straight up C code here. Go has a few differences. First off, you can't initialize arrays and slices as const. The term const has a different meaning in Go, as it does in C. The list should be defined as var instead. There is no char type in Go. You probably want byte (or rune if you intend to allow unicode codepoints). The declaration of the list must have the assignment operator in this case. E.g.: var x = foo. Go's parser requires that each element in a list declaration ends with a comma. This includes the last element. The reason for this is because Go automatically inserts semi-colons where needed. And this requires somewhat stricter syntax in order to work. one common way to define it all at initialization time is using an anonymous struct: var opts = []struct { shortnm byte longnm, help string needArg bool }{ {'a', "multiple", "Usage for a", false}, { shortnm: 'b', longnm: "b-option", needArg: false, help: "Usage for b", }, } This is commonly used for testing as well to define few test cases and loop through them.

Go Language

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