R中的列表排序列表：排序一个列表的值取决于其他列表的值

Question

我需要一些排序列表的帮助。假设我有给出以下的儿童名单：

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

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

我想通过自己的年龄，他们的名字排序，以便获得以下信息：

> "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)]