Vim 9 script questions

[Salman Halim]

Hello,

It's my understanding that Vim 9 functions will get compiled and will be faster than legacy functions, so I'm changing some stuff I've written, but I have some questions:

1. How can I use a Vim 9 function in a mapping? Something like: nmap abc <CMD>call Vim9Func()<cr>

2. Can I call a Vim 9 function defined in another script from a legacy Vim script? How?

3. Can a Vim 9 function be defined inside another function? I want to call an outer function that defines some variables and then returns a function that will have access to those variables, as in a closure or a partial function (where the first few arguments to the function are preset).

Examples of each would be great, if possible, please. I did look through the documentation, but wasn't able to work these out for myself. 

Thank you very much for any help!

--

Salman

[Bram Moolenaar]

Salman Halim wrote:

> It's my understanding that Vim 9 functions will get compiled and will be
> faster than legacy functions, so I'm changing some stuff I've written, but
> I have some questions:
>
> 1. How can I use a Vim 9 function in a mapping? Something like: nmap abc
> <CMD>call Vim9Func()<cr>

Just like before.

> 2. Can I call a Vim 9 function defined in another script from a legacy Vim
> script? How?

Just call it. Keep in mind that in Vim9 script functions are
script-local by default. You can either prefix "g:" to make them global
or use some way to call the script-local function, e.g. by using
:import.

> 3. Can a Vim 9 function be defined inside another function? I want to call
> an outer function that defines some variables and then returns a function
> that will have access to those variables, as in a closure or a partial
> function (where the first few arguments to the function are preset).

This mostly works as you expect.

> Examples of each would be great, if possible, please. I did look through
> the documentation, but wasn't able to work these out for myself.

vim9script

def Test()
var text = 'asdf'

def Inner(): string
return text .. '1234'
enddef

echo Inner()
enddef

Test()

--
What do you get when you cross a joke with a rehtorical question?

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