text: var makeIterator = require('../function/makeIterator_');
  
      /**
       * Returns the index of the first item that matches criteria
       */
      function findIndex(arr, iterator, thisObj){
          iterator = makeIterator(iterator, thisObj);
          if (arr == null) {
              return -1;
          }
  
          var i = -1, len = arr.length;
          while (++i < len) {
              if (iterator(arr[i], i, arr)) {
                  return i;
              }
          }
  
          return -1;
      }
  
      module.exports = findIndex;
  
  