Merge Two Lists in R

Question

I have two lists

first = list(a = 1, b = 2, c = 3)
second = list(a = 2, b = 3, c = 4)

I want to merge these two lists so the final product

Answer 1

In general one could,

merge_list <- function(...) by(v<-unlist(c(...)),names(v),base::c)

Note that the by() solution returns an attributed list, so it will print differently, but will still be a list. But you can get rid of the attributes with attr(x,"_attribute.name_")<-NULL. You can probably also use aggregate().