> On Thu, Feb 02, 2023 at 05:28:03PM +0000, Bram Moolenaar wrote:
> > 3. Add a mechanism to name the members in the call, e.g.
> > var obj = Class.new(line = 5, column = 0)
> > This is similar to 2. but puts it in one line.
> > It requires marking a method to not use positional arguments.a
> >
> > Although 3. looks like a good solution, it requires implementing a new
> > mechanism. And disallowing positional arguments might be considered
> > weird, I cannot think of a language that has this functionality.
>
> Python lets you declare that a function will not accept positional
> arguments:
>
> def fn(*, line, column, also_arg_with_a_default_value=42):
> ...
>
> fn(line=5, column=0)
> fn(column=0, line=5)
> fn(0, 5) # <-- error, positional arguments not allowed
> fn(line=5) # <-- error, 'column' argument is required
I have been using Python but didn't know about this mechanism.
Apparently the "*" can also appear later, e.g.
def fn(line, *, column, also_arg_with_a_default_value=42):
Now you can use:
fn(5, column=0)
Although this works, I find it rather obscure.
--
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/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
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