q.As and q.AsE

Type assertion with a bubble on failure — the comma-ok pattern specialised to v, ok := x.(T).

Signatures

func As[T any](x any) T
func AsE[T any](x any) OkResult[T]

var ErrBadTypeAssert = errors.New("q: type assertion failed")

The type parameter T must be supplied explicitly — Go can't infer it from the single any argument. Both bare and chain forms use q.As[T](x) / q.AsE[T](x).

What q.As does

n := q.As[int](x)

rewrites to:

n, _qOk1 := (x).(int)
if !_qOk1 {
    return /* zeros */, q.ErrBadTypeAssert
}

Chain methods on q.AsE[T]

Same as q.OkE. Useful example:

admin := q.AsE[Admin](user).Wrapf("%T is not an admin", user)

Statement forms

Same five positions as q.Try.

See also

• q.Ok — the general comma-ok shape this specialises.
• q.Recv — the channel-receive cousin.