import ascending from "./ascending.js";
import minIndex from "./minIndex.js";

export default function leastIndex(values, compare = ascending) {
  if (compare.length === 1) return minIndex(values, compare);
  let minValue;
  let min = -1;
  let index = -1;
  for (const value of values) {
    ++index;
    if (min < 0
        ? compare(value, value) === 0
        : compare(value, minValue) < 0) {
      minValue = value;
      min = index;
    }
  }
  return min;
}