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Rebol Programming/Design Guide/Use the shell
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
The command shell is a good way to test an idea or find a quick answer about a function.
In the shell, you can quickly display information about a particular function and its arguments.
In addition the SOURCE function can show you how other functions are written.
>> help func
USAGE:
FUNC spec body
DESCRIPTION:
Defines a user function with given spec and body.
FUNC is a function value.
ARGUMENTS:
spec -- Help string (opt) followed by arg words (and opt type and string) (Type: block)
body -- The body block of the function (Type: block)
(SPECIAL ATTRIBUTES)
catch
>> source func
func: func [
"Defines a user function with given spec and body."
[catch]
spec [block!] {Help string (opt) followed by arg words (and opt type and string)}
body [block!] "The body block of the function"
][
throw-on-error [make function! spec body]
]