1  var baseIndexOf = require('./_baseIndexOf');
 2  
 3  /**
 4   * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
 5   * that is not found in the character symbols.
 6   *
 7   * @private
 8   * @param {Array} strSymbols The string symbols to inspect.
 9   * @param {Array} chrSymbols The character symbols to find.
10   * @returns {number} Returns the index of the last unmatched string symbol.
11   */
12  function charsEndIndex(strSymbols, chrSymbols) {
13    var index = strSymbols.length;
14  
15    while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
16    return index;
17  }
18  
19  module.exports = charsEndIndex;