index output if weights are provided

[azz0r]

I think it would be great if the select function returns the index of the item it chose.

In the code below I would have to add another loop to find the item with that % change of winning and map it back.

const getPercentageAmount = (total, points) => points/total * 100
function App() {
  let items = [
    {
      id: 1,
      points: 89
    },
    {
      id: 1,
      points: 88
    }
  ];
  const total = items.reduce((prev, next) => prev + next.points, 0);
  const weights = []
  items = items.map(item => {
    weights.push(getPercentageAmount(total, item.points))
    return item;
  });

  items = weighted.select(weights)
// returns 50.2 or 49.2

[azz0r]

@Schoonology any chance of a response on this?

[Schoonology]

The interface could be extended, but that would be a backwards-incompatible change. I'd like to modernize the internals at the same time, so that's unlikely to happen right now.

What I've done in the past to solve similar issues is to use the index as the value in the array, so that weighted.select returns the index directly, and you access a secondary array afterward. In your case, you're already calling items.map, and could extend that closure to grab the index during iteration; there's no need to hand-author a second array.

[Schoonology]

@azz0r How did that suggestion work out?

[azz0r]

Hello I am using the same work around you outlined :)