Difference between "and" and && in Ruby?

and has lower precedence, mostly we use it as a control-flow modifier such as if:

next if widget = widgets.pop

becomes

widget = widgets.pop and next

For or:

raise "Not ready!" unless ready_to_rock?

becomes

ready_to_rock? or raise "Not ready!"

I prefer to use if but not and, because if is more intelligible, so I just ignore and and or.

Refer to "Using “and” and “or” in Ruby" for more information.

I don't know if this is Ruby intention or if this is a bug but try this code below. This code was run on Ruby version 2.5.1 and was on a Linux system.

puts 1 > -1 and 257 < 256
# => false

puts 1 > -1 && 257 < 256
# => true

and checks only first condition and gives result on other hand && strongly checks both conditions and gives logical result.