Convert list of struct to a list of another struct when second struct uses a subset of fields

I have two structs, Foo and Bar. Bar uses a subset of of Foo fields:

type Foo struct {
	Id    string
	Name  string
	Extra string
}

type Bar struct {
	Id   string
	Name string
}

I want to convert Foos to Bars. I'm currently doing it like this:

bars := []Bar

for _, foo = range foos {
    bars = append(
        bars,
        Bar{Id: foo.Id, Name: foo.name}
    )
}

Is there a better way to do this in Go?

You can embed Bar into Foo.

type Foo struct {
    Bar
    Extra string
}

type Bar struct {
    Id   string
    Name string
}

var bars []Bar

for _, foo = range foos {
    bars = append(bars, foo.Bar)
}

In your question you state that Bar contains a subset of fields but you cannot have Foo contain a Bar. This tells me that they are in-fact not a subset and are unrelated structs.

As a possible way to keep your intentions clearer in your code, you could do ToBar on the Foo something like this:

type Foo struct {
	Id    string
	Name  string
	Extra string
}

func (foo *Foo) ToBar() Bar {
	return Bar{Id: foo.Id, Name: foo.Name}
}

type Bar struct {
	Id   string
	Name string
}