Is there a way to list out all the object classes in R

Question

Is there a way to list the classes of all objects in my environment? I tried

asd <- iris
sapply(ls(), function(x) class(x))
##         asd 
## "character"

but what I want is

##          asd 
## "data.frame" 

I am assigning the iris data set to the name asd and want its class, but my code is returning "character" instead of "data.frame".

When we have N objects in our environment, we should see how many objects there are and their classes.

Answer 1

You are looking for:

lapply(mget(ls()), class)

Answer 2

There is no need for mget(ls()). Use eapply to obtain the result directly:

x <- double()
m <- matrix()
l <- list()
cc <- eapply(environment(), class)
cc

$x
[1] "numeric"

$l
[1] "list"

$m
[1] "matrix" "array" 

If you want a data frame, then you can do:

data.frame(name = names(cc), class = I(unname(cc)))

  name        class
1    x      numeric
2    l         list
3    m matrix, ....