lift_dl() versus rbind()

lift_dlvsrbind.txt

``` r
library(magrittr)
library(purrr)
#> 
#> Attaching package: 'purrr'
#> The following object is masked from 'package:magrittr':
#> 
#>     set_names

library(microbenchmark)
library(reprex)

microbenchmark(
  1:10 %>%
    map(~list(a = ., b = .)) %>%
    transpose() %>%
    map(unlist) %>%
    lift_dl(data.frame)(),
  
  1:10 %>%
    map(~list(a = ., b = .)) %>%
    do.call(what = rbind, args = .) 
)
#> Unit: microseconds
#>                                                                                              expr
#>  1:10 %>% map(~list(a = ., b = .)) %>% transpose() %>% map(unlist) %>%      lift_dl(data.frame)()
#>                             1:10 %>% map(~list(a = ., b = .)) %>% do.call(what = rbind, args = .)
#>      min       lq     mean  median      uq      max neval cld
#>  537.991 616.6795 765.5846 705.418 765.075 3498.220   100   b
#>  248.896 280.1150 345.6871 332.289 351.319 1193.586   100  a
```

<sup>Created on 2018-12-19 by the [reprex package](https://reprex.tidyverse.org) (v0.2.1)</sup>