On Sunday, July 17, 2016 at 2:56:44 AM UTC+9, Bram Moolenaar wrote:
> Ken Hamada wrote:
>
> > Hi Bram and Ken Takata.
> >
> > I think there is some problem in variable substitution of lambda function.
> >
> > echo ({y -> ({x -> x(y)(10)})({y -> y})})({z -> z})
> >
> > yields an error `E121: Undefined variable: y`. I expect this expression
> > yields 10. I tested on Vim 7.4.2048.
> >
> > JavaScript:
> > (function(y){ return (function(x){ return x(y)(10); })(function(y){ return
> > y; }); })(function(z){ return z; })
> >
> > Python:
> > (lambda y: (lambda x: x(y)(10))(lambda y: y))(lambda z: z)
> >
> > Ruby:
> > (lambda {|y| (lambda {|x| (x.call(y)).call(10)}).call(lambda {|y|
> > y})}).call(lambda {|z| z})
> >
> > All these expressions prints 10 as expected.
>
> This is because Vim does not support a closure yet. You are using this
> lambda:
> {x -> x(y)(10)}
> You can see that "y" is not defined here. It would come from the
> context, but that isn't supported.
>
I see. Thanks for explanation.
Regards,
Ken Hamada
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