/**
 * Used by `_.trim` and `_.trimRight` to get the index of the last character
 * of `string` that is not found in `chars`.
 *
 * @private
 * @param {string} string The string to inspect.
 * @param {string} chars The characters to find.
 * @returns {number} Returns the index of the last character not found in `chars`.
 */
function charsRightIndex(string, chars) {
  var index = string.length;

  while (index-- && chars.indexOf(string.charAt(index)) > -1) {}
  return index;
}

module.exports = charsRightIndex;