V: Function inside a function

[zaoqi]

fn double(i int) int{
 fn g(n int) int {
  return n+i
 }
 return g(i)
}
fn main() {
 println(double(1))
}

I want to build success but it showed

unexpected token: `fn`
    1| fn double(i int) int{

[r-k-o]

yes, yes, i really wished we could have that!

[nedpals]

Might as well be perfect to just have anonymous functions assigned to a variable

[dhonx]

agree with @nedpals ☝️

[r-k-o]

Take as look at "https://en.wikipedia.org/wiki/Nested_function". It provides for elegant programs and less global variables.

[medvednikov]

This will work like in Go and like @nedpals suggested: anonymous functions assigned to a variable.

[nedpals]

Look, we aren't trying to duplicate what Javascript and other programming languages did with multiple ways of writing a function inside a function and it makes so much sense to this:

fn double(i int) int{
 g := fn (n int) int {
  return n+i
 }
 return g(i)
}
fn main() {
 println(double(1))
}

than the example you have suggested. It's clear and easier to parse both by the user and v compiler.

[mokafolio]

I agree with @nedpals. This would reduce redundancy and might also be a clear answer to https://github.com/vlang/v/issues/163 . I personally think that having anonymous functions is good enough for both of these things.

[lutherwenxu]

As mentioned above, the way to do it in V would to be assigning a lambda to a variable.