The struct keyword is redundant to declare anonymous structures

[gchumillas]

Maybe the struct keyword is redundant, as the { symbol already suggests an anonymous structure. For example, without the struct keyword we could write code in a more concise way:

struct Person {
	name string
	location {
		country string
		city string
	}
}

fn config(options ?{ lang string theme string }) {
 	// ...
}

fn main() {
	p := Person{
		name: 'John Smith',
		location: {
			country: 'US',
			city: 'New York'
		}
	}
	println(p)
}

[JalonSolov]

A { by itself implies a new block, not a struct. The struct keyword is needed to help the parser figure out that you're trying to create an anonymous struct rather than just a new code block.

[gchumillas]

Thanks for the clarification. I really like the struct keyword :) And it would be nice to be able to create anonymous structures on the fly using it:

// this code doesn't compile
book := struct {
	title: 'Allice in Wornderland'
	isbn: '1503222683',
	year: 1865
}

[JalonSolov]

https://docs.vlang.io/structs.html#anonymous-structs

[JalonSolov]

To wrap this up, the example is now possible since #23857 was merged.

The only thing you get now is a warning about the unused variable...

$ v run x.v
x.v:1:1: warning: unused variable: `book`
    1 | book := struct {
      | ~~~~
    2 |     title: 'Allice in Wornderland'
    3 |     isbn: '1503222683',
$

[hellolio]

@JalonSolov

struct Book {
    author struct {
        name string
        age  int
    }

    title string
}

struct Book and author struct
Why are keywords sometimes at the front and sometimes at the end? Can this be unified?

[JalonSolov]

No. Named struct and anonymous struct are 2 different things, with different syntax.

struct Book { is declaring a named struct, Book.

author struct { is creating a field in Book with an anonymous (not named) struct.

[hellolio]

good