Allow sending objects as items

[cowchimp]

Hi.

Thanks for this library.
I have a suggestion for an additional feature which I think will be useful.

Right now you have to pass in an array of arrays.
That means that if I have an object that contains a property for the "value" and another property for the "weight", I would have to transform it to that temporary array.
What if instead I could do this:

let input = [
  {
    somePropertyNameForValue: 100,
    somePropertyNameForWeight: 2,
    someOtherPropertyNotRelevant: 'Foo'
  },
  {
    somePropertyNameForValue: 50,
    somePropertyNameForWeight: 4,
    someOtherPropertyNotRelevant: 'Bar'
  },
  {
    somePropertyNameForValue: 25,
    somePropertyNameForWeight: 1,
    someOtherPropertyNotRelevant: 'Baz'
  },
];

let mean =  weightedMean(input, x => somePropertyNameForValue, x => x.somePropertyNameForWeight);

Thanks!

[satazor]

I understood your suggestion but, unless the array is really huge, you can just do a .map as you said to generate the input. I would like to keep this module simple.