Wanted, anonymous function syntax with parameters

[PhilAndrew]

In Scala you can write.

scala> (1 until 1000).filter(n => n % 3 == 0 || n % 5 == 0).foldLeft(0)( + ) res2: Int = 233168

n => n % 3 == 0... this is a function with parameter n.

Could

_.each (abc) @(num, key)
  console.log ( "#(num) #(key)" )

Be written more concisely as something like:

_.each (abc) @{console.log ( "#(_.1) #(_.2)")}

I do not have any good suggestion for syntax.

[refractalize]

Have to give this one some thought...

Was originally intending to use @1, @2, etc. But thought on reflection that it's usually better to be a little verbose with your params anyway. For common functions, like map and filter that only pass one parameter for example, this sort of thing could be useful.

[PhilAndrew]

Yes the interesting thing is there's so many ways to do it. For example in Scala.

(1 to 1000).reduceLeft( _ + _ )

The + is a notation which produces the function (a,b) => a + b which could also be written as

def add(a,b) = {
  a + b
}

(1 to 1000).reduceLeft(add)

Then you could look at LiveScript and how it chains functions together to map fold etc. With so many ways to do it, you have a problem of choice, what is going to work well with your language.