Conjuring JQuery Deferred with monadic incantations

Question

Inspired by this (excellent) discussion of using Promises in javascript, I\'m trying to work out how I could use Deferred to chain together async and non-async functions, to

Answer 1

I think the way that you'd turn a value into a Promise is to just "pre-succeed" the Deferred:

function v2p(value) {
  var rv = $.Deferred();
  rv.resolveWith(null, [value]);
  return rv.promise();
}

Now passing a function to ".done()" will result in the function being immediately called with the value.

v2p("hello").done(function(value) { alert(value); });

would immediately alert "hello".