Type aliases
In V type aliases is a special case of a sum type declaration.
type MyString = string
Type aliases are useful for creating a new name for an existing type.
For example, you can use a type alias to make a string type more descriptive:
type RawHtml = string
type SafeHtml = string
Like other types, alias types can have methods:
type RawHtml = string
type SafeHtml = string
fn (html RawHtml) escape() SafeHtml {
// ...
}
Alias types inherit all methods of the base type:
type RawHtml = string
fn main() {
s := RawHtml('<html><html/> ')
println(s.trim(' ')) // <html><html/>
}
If the base type is a structure, then all fields are also inherited:
type RawHtml = string
fn main() {
s := RawHtml('<html><html/>')
println(s.len) // 13
}
Type aliases are also useful for shortening long type names:
type IDs = GenericMap[string, GenericMap[string, int]]