function _booleansArrayToNumbersForIndex (booleanArrayIndex) {
  // gets an array of booleans and returns an array of numbers
  const indexOfNumbers = []
  booleanArrayIndex.forEach((bool, idx) => {
    if (bool) {
      indexOfNumbers.push(idx)
    }
  })
  return indexOfNumbers
}
Receives an array of booleans and returns an array of Numbers for Index
@param {Array} booleanArrayIndex An array of booleans
@return {Array} A set of numbers ready for index