Hi, your list contains 3 lists, how do they relate to each other ?

I have to assume you want columns a,b,c,d but you have provided both numbers and characters to populate them, a tibble needs a column to have a single type. I will therefore have to assume that you mean characters, because i cant represent the 'a','b','c','d' you declared as numbers.

```
library(tidyverse)
l <- list(list(a = 1,b = 2, c = 3, d = 4), list(a = "a", b = "b", c = "c", d = "d"), list(a = 5, b = 6, c = 7, d = 8))
l2 <- map(l,~data.frame(.))
l3 <-map_dfr(l2,~mutate_all(.,as.character))
l4<-as_tibble(l3)
# A tibble: 3 x 4
a b c d
<chr> <chr> <chr> <chr>
1 1 2 3 4
2 a b c d
3 5 6 7 8
```