Is there a reason that the new `pivot_*()`

functions in {tidyr} order their output differently to `gather()`

/`spread()`

? Am I missing something?

For example, the `gather()`

output in the reprex below is ordered within 'year', but the `pivot_longer()`

output is ordered within 'country'.

Context: I've considered updating the Software Carpentry course on dataframe manipulation with tidyr, given the changes to {tidyr} in version 1.0.0.

```
# Load {tidyr} >= 1.0.0
library(tidyr)
# Toy data set
data <- tibble(
country = c("C", "A", "B"),
X = c(3, 1, 2),
Y = c(2, 1, 3)
)
# Data set before reshaping
data
#> # A tibble: 3 x 3
#> country X Y
#> <chr> <dbl> <dbl>
#> 1 C 3 2
#> 2 A 1 1
#> 3 B 2 3
# Output is ordered by supplied year
gather(
data, Y, X,
key = "year", value = "cases"
)
#> # A tibble: 6 x 3
#> country year cases
#> <chr> <chr> <dbl>
#> 1 C Y 2
#> 2 A Y 1
#> 3 B Y 3
#> 4 C X 3
#> 5 A X 1
#> 6 B X 2
# Output is ordered by supplied year, within country
pivot_longer(
data, cols = c(Y, X),
names_to = "year", values_to = "cases"
)
#> # A tibble: 6 x 3
#> country year cases
#> <chr> <chr> <dbl>
#> 1 C Y 2
#> 2 C X 3
#> 3 A Y 1
#> 4 A X 1
#> 5 B Y 3
#> 6 B X 2
```

^{Created on 2019-11-04 by the reprex package (v0.3.0)}