I'm trying to pass a struct into a Go template using the built-in http/template library. I'm finding, though, that if I name the struct's variables with the first letters lowercase, they are not rendered in the template, but if I name them with the first letter uppercase, they are. I see here that structs can have both upper and lower case first letters. Why, then, does the Go templating engine not render both?
For examples, see:
Thanks in advance.
分享 Simply put, the template engine can't see the members when they are written in lower case as the template engine is in another package than your struct.
You may have noticed that Go does not use private or public keywords for visibility.
Instead, all functions, members, variables and the like are public when the first letter
of the identifier is in upper case. If the identifiers are not exported they can only
be used in the same package.
The spec on exporting identifiers:
An identifier may be exported to permit access to it from another package. An identifier is exported if both:
- the first character of the identifier's name is a Unicode upper case letter (Unicode class "Lu"); and
- the identifier is declared in the package block or it is a field name or method name.
All other identifiers are not exported.
分享
