Question

is there a way to return an object from a comprehension in coffeescript? something so that i could express this:

form_values = () ->
  ret = {}
  ret[f.name] = f.value for f in $('input, textarea, select')
  return ret

like this:

form_values = () -> f.name, f.value for f in $('input, textarea, select')

i’d like to construct a single object (not an array of objects). so if the markup looks something like this:

<form name=blah>
  <input type=text name=blah1 value=111 />
  <textarea name=blah2>222</textarea>
  <select name=blah3>
    <option value=333a>
    <option value=333b>
  </select>
</form>

the returned object would be something like this:

{
  blah1: '111',
  blah2: '222',
  blah3: ''
}

Answer 1

Nope. Comprehensions only return arrays in CoffeeScript. Search the issue tracker for object comprehensions, and you’ll find several proposals, but none were found suitable.