Get field label in X++ (D365 FnO)

The simplest way to achieve this is by

 SysDictField dict = new SysDictField(tableId, fieldId);  
 str label = dict.label();  

Other way to get the label for any EDT, table or table field is :

 //Get label of field  
 label = fieldPName(EmplTable, EmplId);  
 info('Field name: '+label); 
 
 //Get label of EDT:  
 label = new SysDictType(extendedTypeNum(EmplId)).label();  
 info('EDT name: '+label); 
 
 //Get label of table  
 label = tablePName(EmplTable);  
 info('Table name: '+label);