import cb from './_cb.js';
import getLength from './_getLength.js';

// Use a comparator function to figure out the smallest index at which
// an object should be inserted so as to maintain order. Uses binary search.
export default function sortedIndex(array, obj, iteratee, context) {
  iteratee = cb(iteratee, context, 1);
  var value = iteratee(obj);
  var low = 0, high = getLength(array);
  while (low < high) {
    var mid = Math.floor((low + high) / 2);
    if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;
  }
  return low;
}