访问嵌套向量列表中的元素

Question

have the following list of vectors:

ourTeams <- list("eric" = c("tigers"), "tate" = c("vols","titans"),"heather" = c("gators","tide"))

need to use a for loop to access the keys, values in the list so the output looks like this:

eric likes the tigers

tate likes the vols and titans

heather likes the gators and tide

our code can't "hard code" the number of elements in the list... so that if I add elements to one of the

lists nested in the vectors it will still work. I'm pretty sure they want me to use a for loop.

Answer 1

# list example
ourTeams <- list("eric" = c("tigers"), "tate" = c("vols", "titans"), "heather" = c("gators","tide"))

# list indexing
ourTeams[1]
names(ourTeams[1])
ourTeams[[1]]

# paste0 with sep and collapse
paste0( ourTeams[[2]], sep="," ) # vector of string
paste0( ourTeams[[2]], collapse=", " ) # collapse to a single string

# sprintf (%s for string)
sprintf("my stackoverflow reputation is %s", "10")

# putting this together
for(i in 1:3) {
  print( sprintf("%s likes the %s", names(ourTeams[i]), paste0(ourTeams[[i]], collapse=" and " ) ) )
}