exercise 3.14.3 error ?

[CharlesMagne]

sort(x^2-5)[1:2] can be rewritten as:
x %>% raise_to_power(2) %>% subtract(5) %>% extract(1:2,)
Returns: Error in extract(., 1:2, ) : incorrect number of dimensions
Correct solution:
x %>% raise_to_power(2) %>% subtract(5) %>% sort %>% extract(1:2)