underfail.coffee

data = 
  a: 0
  b: "foo"
  
result = _(data).reject((v,k) -> k == 'b')
  

expect(result).toEqual(a: 0) #but fail! it returns: [0]


# so far now, I could settle for this:

newData = _(data).clone()  
_(newData).each (v,k) -> delete newData[k] if k == 'b'

_.reject is a collection method, not an object method.

See: this excerpt from the reject method: (!iterator.call(context, value, index, list)) results[results.length] = value;

Right, I'm just using _.reject as an example. Most of the collection functions iterate perfectly well over objects, but only return arrays. That always surprises me.

Yea, It does seem odd. I've hacked together a gist that could become a _(data).object_reject: https://gist.github.com/1720187

A better option would be to extend underscore to make it saner when it's iterating over an object.

Thanks Zach. Yeah, I just hacked my own underscore mixin _.withoutProperties

http://tryjasmine.com/?gist=1720249