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Ruby On Rails Interview Questions and Answers

Ques. What is the difference between ‘&&’, ‘AND’ and ‘&’ operators?

The ‘&&’ and ‘and’ are both logical and statements. They ‘&&’ operator has higher precedence though. Here’s an example of illustrate this in more detail:

foo = 3
bar = nil
a = foo and bar
# => nil
# => 3
a = foo && bar
# => nil
# => nil
Notice how the statement ‘a = foo and bar’ actually behaves like ‘(a = foo) and bar’
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