從嵌套屬性獲取總和的更方便的方法

Question

更簡單的方法是什麼？

def totalSightings=0; 
year.months.each{month-> 
    month.weeks.each{week-> 
     week.days.each{day-> 
      total+=day.sightings; 
     } 
    } 
} 

Answer 1

year.months​.weeks​.days​.sightings.flatten().sum()