export default function count(values, valueof) {
  let count = 0;
  if (valueof === undefined) {
    for (let value of values) {
      if (value != null && (value = +value) >= value) {
        ++count;
      }
    }
  } else {
    let index = -1;
    for (let value of values) {
      if ((value = valueof(value, ++index, values)) != null && (value = +value) >= value) {
        ++count;
      }
    }
  }
  return count;
}