What do you name this function? It transforms an array of objects into an object with `values` and an `allKeys` array.

name-me.js

// So I'm struggling to name this function so I called it `indexArrayBy`
// but it's really doing more. Here's a link to it's demo:
// Demo: https://playcode.io/612180/

/**
* Transforms an array of objects into an object containing the values
* indexed by a unique property on each object, e.g. id  and
* an array containing all the keys (So you get the keys).
*
* @param {Array<Object>} array Array of objects
* @param {String} key Property by which to key all objects
* @returns {{ values: Object, allKeys: Array<Number|String> }}
*/

function indexArrayBy (array, key = 'id') {
  const allKeys = new Set()

  const values = array.reduce((acc, cur, index) => {

    if (!cur[key]) {
      throw new Error(`Key "${key}" does not exist in the object at index "${index}"`)
    }

    if (acc[cur[key]]) {
      console.warn(`Key provided "${key}" is not unique. Will overwrite previously set values.`)
    }

    allKeys.add(cur[key])
    acc[cur[key]] = cur

    return acc
  }, {})

  return {
    values,
    allKeys: [...allKeys]
  }
}

See it action here: https://playcode.io/612180/