Feature: function creation

[dbkaplun]

It would be really cool if I could do _.pluck('length').max() and get a function which I can pass a parameter to that will return the result having passed it in the first place.

[akre54]

Are you talking something like _.partial or _.compose from Underscore?

[dbkaplun]

Kind of. I think it would be awesome if _.pluck('length').max() returned function (val) { _(val).pluck('length').max(); }.

[akre54]

Ah, so sort of more like _.property then. jashkenas/underscore#1582 is considering implementing a more flexible version of this across a few of the core Underscore functions. maybe Lazy could do something similar.

[dtao]

There's actually already something like this, but only for functions that return sequences (not values, so not max); and the interface isn't too great so it will probably change.

But there is a method called apply which will treat a sequence as a sort of "query" and get the result of applying that query to an underlying source.

For example:

var query = Lazy()
  .map(function(x) { return x * -1; })
  .filter(function(x) { return x > 0; });

query.apply([1, -2, 5, -6]);
// => [2, 6]

I think implementing a more full-fledged version of this, with support for things like max as you suggest, is an interesting idea. I'll think on it.