Re: Vim9: how to invoke callback with additional arguments?

> I am trying to understand how to invoke a callback in Vim9 script.
> I have started from this example (from the excellent lacygoill's wiki):
>
> vim9script
>
> def Callback(_j: job, _e: number)
> echom 'callback'
> enddef
>
> def Func()
> job_start(['/bin/bash', '-c', ':'], {exit_cb: Callback})
> enddef
>
> Func()
>
> That's fine, but now suppose that I want to pass additional arguments to
> Callback(). What is Vim9's equivalent of the following?
>
> fun Callback(value, _j, _e)
> echom 'callback with value: ' .. a:value
> endf
>
> fun Func()
> call job_start(['/bin/bash', '-c', ':'],
> \ {'exit_cb': function('Callback', [42])})
> endf
>
> call Func()

I don't think there is a difference, you can still use function() to
create a partial.

Is there a "Vim9 way" that would be better? You could use a lambda:

call job_start(['/bin/bash', '-c', ':'],
\ {'exit_cb': (j, e) => Callback(42, j, e)})

It looks a bit nicer. I haven't tried it, you may need to add types.

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-- Vince Negri

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