Class Attribute

 // Reads the first and last name of each person and adds a new attribute with 
 // the full name. 
 let 
  
 xml 
  
 = 
  
 '<roster>' 
  
 + 
  
 '<person first="John" last="Doe"/>' 
  
 + 
  
 '<person first="Mary" last="Smith"/>' 
  
 + 
  
 '</roster>' 
 ; 
 const 
  
 document 
  
 = 
  
 XmlService 
 . 
 parse 
 ( 
 xml 
 ); 
 const 
  
 people 
  
 = 
  
 document 
 . 
 getRootElement 
 (). 
 getChildren 
 ( 
 'person' 
 ); 
 for 
  
 ( 
 let 
  
 i 
  
 = 
  
 0 
 ; 
  
 i 
 < 
 people 
 . 
 length 
 ; 
  
 i 
 ++ 
 ) 
  
 { 
  
 const 
  
 person 
  
 = 
  
 people 
 [ 
 i 
 ]; 
  
 const 
  
 firstName 
  
 = 
  
 person 
 . 
 getAttribute 
 ( 
 'first' 
 ). 
 getValue 
 (); 
  
 const 
  
 lastName 
  
 = 
  
 person 
 . 
 getAttribute 
 ( 
 'last' 
 ). 
 getValue 
 (); 
  
 person 
 . 
 setAttribute 
 ( 
 'full' 
 , 
  
 ` 
 ${ 
 firstName 
 } 
  
 ${ 
 lastName 
 } 
 ` 
 ); 
 } 
 xml 
  
 = 
  
 XmlService 
 . 
 getPrettyFormat 
 (). 
 format 
 ( 
 document 
 ); 
 Logger 
 . 
 log 
 ( 
 xml 
 );