true and false # => false
false and true # => false
true and true # => true
false and false # => false
true && false # => false
false && true # => false
true && true # => true
false && false # => false
x = true and false # => false
p x # => true !!!!!!!!!!
x = false and true # => false
p x # => false
x = true and true # => true
p x # => true
x = false and false # => false
p x # => false
x = true && false # => false
p x # => false
x = false && true # => false
p x # => false
x = true && true # => true
p x # => true
x = false && false # => false
p x # => false
https://docs.ruby-lang.org/ja/latest/doc/spec=2foperator.html
Has a lower priority than =, so with x = true and false
Will occur, and x will not become false.
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