Why does summarize function don't get an error?

Question

We all know that we can compute any summary that operates on vectors and returns a single value in R base. I want to ask that why I don't get an error when I attempt to use quantile which returns more than one value function inside of summarize?

heights %>%
    filter(sex == "Male") %>%
    summarize(range = quantile(height, c(0, 0.5, 1)))

result is not an error:

     range
1 50.00000
2 69.00000
3 82.67717

Answer 1

Just making my comment and @27ϕ9's an answer.

As of dplyr version 1.0.0, summarise allows to return outputs containing more than one value.

Example:

mtcars %>%
  group_by(cyl) %>%
  summarise(qs = quantile(disp, c(0.25, 0.75)), prob = c(0.25, 0.75))

# A tibble: 6 x 3
# Groups:   cyl [3]
#     cyl    qs  prob
#   <dbl> <dbl> <dbl>
# 1     4  78.8  0.25
# 2     4 121.   0.75
# 3     6 160    0.25
# 4     6 196.   0.75
# 5     8 302.   0.25
# 6     8 390    0.75

See the documentation for more examples.