Merge list of list on sublist level

Question

I am given two list of lists. I would like to merge the list on the sublist Level. As an example, I am given

L1 <- list(list("a"=1,"b"=2),list("a"=10,"b"=20))
L2 <- list(list("c"=3,"d"=4),list("c"=5,"d"=6))

I would like to create a total list looking as follows:

Ltot<-list(list("a"=1,"b"=2,"c"=3,"d"=4),list("a"=10,"b"=20,"c"=5,"d"=6))

Related [Merge Two Lists in R](https://stackoverflow.com/questions/9519543/merge-two-lists-in-r) — markus, Jun 27 '19 at 09:59

score 2 · Accepted Answer · answered Jun 27 '19 at 08:59

2

You can use Map, i.e.

Map(`c`, L1, L2)

identical(Map(`c`, L1, L2), Ltot)
#[1] TRUE

answered Jun 27 '19 at 08:59

Sotos

What's the purpose of the backtick on `c`? `Map(c, L1, L2)` works just as fine. – nicola Jun 27 '19 at 13:30
@nicola I guess it's a habit of mine when using such functions (`Map`, `Reduce`, etc) and do not specify `Map(function(i)c(i), ...)` – Sotos Jun 27 '19 at 13:59

score 0 · Answer 2 · answered Jun 27 '19 at 13:50

0

We can use map2 from purrr

library(purrr)
map2(L1, L2, c)

answered Jun 27 '19 at 13:50

akrun

2 Answers2