We can make it better!
keys.each
map {}.flatten
reverse.each
each.with_index
each.with_object
Slide 28
Slide 28 text
We can make it better!
keys.each
map {}.flatten
reverse.each
each.with_index
each.with_object
each_key
reverse_each
each_with_object
each_with_index
flat_map {}
Slide 29
Slide 29 text
If you see two existing
methods joined with an
underscore.
It’s probably an optimization.