How to execute the contents of a buffer?

Question

I have a vim script I\'m developing in my current buffer and I want to execute it. Is there a simple way to do it?

After a long search I have only found two related

Answer 1

An autocmd to source the file whenever you save might help:

autocmd BufWritePost <buffer> source %

Answer 2

Use:

:%y"                      (alternatively: ggyG)
:@"

It will copy whole buffer into default register and then run it.

See :help :y and :help :@ (and also :help range maybe).