How can I convert a type to a new one based on it?

I create a new type to add custom methods specific for my app’s needs

type Content html.Node

I know I can derivate a html.Node from a content var of type Content doing this

node := html.Node(content)

But, having a var of type html.Node, how can I convert to a Content ?

I discovered that doing the following …

ndoe, err := htmlquery.LoadURL(page.url)

content := Content(node) 

… cannot work. It gives me this error:

cannot convert doc (variable of type *html.Node) to type Content

>Solution :

https://go.dev/ref/spec#Conversions

If node is html.Node use:

c := Content(node)

If node is *html.Node use:

c := (*Content)(node)

Note from the above linked spec: "If the type starts with the operator * … it must be parenthesized when necessary to avoid ambiguity."

And if you want Content instead of *Content then you need to dereference the pointer, either before conversion or after, e.g.:

c := Content(*node) // dereference before conversion
// or
c := *(*Content)(node) // dereference after conversion

https://go.dev/play/p/zAu4H1R2D-L