use the keyword and instead of &&.


ruby = "nifty"
programming = "fun"
if ruby == "nifty" and programming == "fun"
  puts " and and"
end

1.	the && operator means "and."
2.	have more than two statements separated by &&
3.	\|\| operator is or.
4.	check whether one or the other is true by using \|\|
5.	Are more than two statements OK?
6.	Chaining together multiple comparisons is also possible with a clever use of parentheses:
7.	And, or and Not
8.	Use or in if statement

use the keyword and instead of &&. : Boolean Operators « Language Basics « Ruby