Monday, March 1, 2021

Re: Vim9: call function from variadic function?

> This might be a bit of a stretch, but... is it possible to
> "expand/split" variable arguments to call another function with fixed
> arguments? I would like to define a function that takes as input another
> function F and some values v1, vn... , and applies F to v1, ..., vn.
>
> For example, I can define:
>
> def F(a: string, b: number)
> enddef
>
> def G(...values: list<any>): void
> F(values[0], values[1])
> enddef
>
> G('xyz', 42)
>
> I would like to generalize G so that it can invoke any function, i.e.:
>
> def G2(F: func, ...values: list<any>): void
> F(XXXX)
> enddef
>
> G2(F, 'xyz', 42)
>
> The problem is: what can I put in place of XXXX? F(values) doesn't cut
> it.

Why not use call():
call(F, ['xyz', 42])

Or, if you need G2() to do something more:
def G2(F: func, ...values: list<any>): void
call(F, values)
enddef

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