text: var append = require('./append');
  var makeIterator = require('../function/makeIterator_');
  
  /**
   * Maps the items in the array and concatenates the result arrays.
   */
  function collect(arr, callback, thisObj) {
      callback = makeIterator(callback, thisObj);
      var results = [];
      if (arr == null) {
          return results;
      }
  
      var i = -1, len = arr.length;
      while (++i < len) {
          var value = callback(arr[i], i, arr);
          if (value != null) {
              append(results, value);
          }
      }
  
      return results;
  }
  
  module.exports = collect;
  
  
  