pmap_qto

[ElianHugh]

Resolves #8.

Changes:

• Introduces a pmap_qto to compliment the map_qto function introduced by @elipousson
• map_qto should be slightly more performant (function building is done outside the map call)
• collapse and sep are now passed to .type functions where relevant
• Add tests for pmap_qto and map_qto

---

pmap_qto mirrors purrr's pmap function, allowing for mapping over lists in parallel. For example:

pmap_qto(
     list(
         list("Answer:", "Answer:", "Answer:"),
         list("Yes", "No", "Yes")
     )
)

#> [[1]]
#> Answer: Yes
#>
#> [[2]]
#> Answer: No
#>
#> [[3]]
#> Answer: Yes

We can pass custom functions just like the original pmap function

pmap_qto(
    mtcars[1L:3L, 1L:3L],
    function(mpg, cyl, disp) {
        qto_li(
            .list = list(
                sprintf("mpg is: %s", mpg),
                sprintf("cyl is: %s", cyl),
                sprintf("disp is: %s", disp)
            )
        )
    }
)

#> [[1]]
#> 
#> * mpg is: 21
#> * cyl is: 6
#> * disp is: 160
#> 
#> [[2]]
#> 
#> * mpg is: 21
#> * cyl is: 6
#> * disp is: 160
#> 
#> [[3]]
#> 
#> * mpg is: 22.8
#> * cyl is: 4
#> * disp is: 108
#>