text: var sort = require('./sort');
  var makeIterator = require('../function/makeIterator_');
  
      /*
       * Sort array by the result of the callback
       */
      function sortBy(arr, callback, context){
          callback = makeIterator(callback, context);
  
          return sort(arr, function(a, b) {
              a = callback(a);
              b = callback(b);
              return (a < b) ? -1 : ((a > b) ? 1 : 0);
          });
      }
  
      module.exports = sortBy;
  
  
  