text: System.register([], (function () {
  	'use strict';
  	return {
  		execute: (function () {
  
  			for ( let i = 0; i < 10; i += 1 ) console.log( i );
  			for ( const letter of array ) console.log( letter );
  			for ( const index in array ) console.log( index );
  
  			let i;
  			for ( i = 0; i < 10; i += 1 ) console.log( i );
  
  			let letter;
  			for ( letter of array ) console.log( letter );
  
  			let index;
  			for ( index in array ) console.log( index );
  
  		})
  	};
  }));
  