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.
> Anyway, 7.4.2044 is surely a great advance in the history of Vim
> script. Thanks.
Glad you like it.
--
Luxury. We used to have to get out of the lake at three o'clock in the
morning, clean the lake, eat a handful of hot gravel, go to work at the
mill every day for tuppence a month, come home, and Dad would beat us
around the head and neck with a broken bottle, if we were LUCKY!
/// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net \\\
/// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\ an exciting new programming language -- http://www.Zimbu.org ///
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