R中的列表排序列表：排序一個列表的值取決於其他列表的值

Question

我需要一些排序列表的幫助。假設我有給出以下的兒童名單：

a <- list(name = "Ann", age = 9) 
b <- list(name = "Bobby", age = 17) 
c <- list(name = "Alex", age = 6) 

my.list <- list(a, b, c) 

我想通過自己的年齡，他們的名字排序，以便獲得以下信息：

> "Alex" "Ann" "Bobby" 

Answer 1

a <- list(name = "Ann", age = 9) 
b <- list(name = "Bobby", age = 17) 
c <- list(name = "Alex", age = 6) 

L <- list(a,b,c) 
ages <- sapply(L,"[[","age") 
names <- sapply(L,"[[","name") 
names[order(ages)]