The pipe operator in R (really, tidyverse R, which might as well be its own language) is one of its "killer apps" for me. Working with data is so, so pleasant and easy. I remember a textbook that showed two ways of "coding" a cookie recipe:

bake(divide(add(knead(mix(flour, water, sugar, butter)),eggs),12),450,12)

versus

mix(flour, water, sugar, butter) %>% knead() %>% add(eggs) %>% divide(12) %>% bake(temp=450, minutes=12)

So much easier!