Use head() to fetch first N rows and tail() to fetch last N rows.
head(airquaity, N) and tail(airquality, N)
top_n( ) and top_frac( ) also is used to fetch the top n records by nunber or fraction.
top_n(x, n, wt)
top_frac(x, n, wt)
df %>% top_n(n() * .5)
df %>% top_frac(.5)
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