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          


        

Answer 1

There's var.is_a? Class (in your case: var.is_a? Integer); that might fit the bill. Or there's Integer(var), where it'll throw an exception if it can't parse it.