baseFindIndex.js

/**
 * The base implementation of `_.findIndex` and `_.findLastIndex` without
 * support for callback shorthands and `this` binding.
 *
 * @private
 * @param {Array} array The array to search.
 * @param {Function} predicate The function invoked per iteration.
 * @param {boolean} [fromRight] Specify iterating from right to left.
 * @returns {number} Returns the index of the matched value, else `-1`.
 */
function baseFindIndex(array, predicate, fromRight) {
  var length = array.length,
      index = fromRight ? length : -1;

  while ((fromRight ? index-- : ++index < length)) {
    if (predicate(array[index], index, array)) {
      return index;
    }
  }
  return -1;
}

module.exports = baseFindIndex;