replace function with ruby style block

Armed with underscore, I could achieve something fantastic like below:

_([1,2,3]).chain().map(function(n) {return n*2}).reduce(function(m,a) {return m +a},0).value()

Obviously, the most verbose part is the definition of function. Could it be more simpler? Something like:

 _([1,2,3]).chain().map( {|n| return n*2} ).reduce({|m,a| return m+2; },0).value开发者_如何学C()

If you take delight in writing compact functional programming, check Functional (caveat: it takes the non-OOP approach):

JS> reduce('+', 0, map('*2', [1, 2, 3]))
12

It feels almost like you are writing Haskell ;-)

Haskell> foldl (+) 0 (map (*2) [1, 2, 3])
12

If you were using CoffeeScript you could write

_([1,2,3]).chain().map((n) -> n*2).reduce((m,a) -> m+2, 0).value()

using anonymous functions.

JavaScript doesn't have blocks of course.