How to check if a number is included in a range (in one statement)?

Question

I am using Ruby on Rails 3.0.9 and I would like to check if a number is included in a range. That is, if I have a variable number = 5 I would like to check 1 <= number <= 10 and retrieve a boolean value if the number value is included in that range.

I can do that like this:

number >= 1 && number <= 10 

but I would like to do that in one statement. How can I do that?

Answer 1

(1..10).include?(number) is the trick.

Btw: If you want to validate a number using ActiveModel::Validations, you can even do:

validates_inclusion_of :number, :in => 1..10 

read here about validates_inclusion_of

or the Rails 3+ way:

validates :number, :inclusion => 1..10 

Answer 2

Enumerable#include?:

(1..10).include? n 

Range#cover?:

(1..10).cover? n 

Comparable#between?:

n.between? 1, 10 

Numericality Validator:

validates :n, numericality: {only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: 10} 

Inclusion Validator:

validates :n, inclusion: 1..10