ruby - Checking if a variable is an integer

Question

Does Rails 3 or Ruby have a built-in way to check if a variable is an integer?

For example,

1.is_an_int #=> true
"dadadad@asdasd.net".is_an_int #=> false?

Answer 1

You can use the is_a? method

>> 1.is_a? Integer
=> true
>> "dadadad@asdasd.net".is_a? Integer
=> false
>> nil.is_a? Integer
=> false