Null True False in Ruby

To check if a value is null/true/false in Ruby, you can use the following methods:

1. nil? method: This method is used to check if a value is nil or not.

value = nil
puts value.nil? # Output: true
value = "Hello"

puts value.nil? # Output: false

2. true? and false? methods: These methods are used to check if a value is true or false.

value = true
puts value.true? # Output: true
value = false

puts value.false? # Output: true

Note: In Ruby, nil is considered as a false value.

value = nil
puts value.true? # Output: false
puts value.false? # Output: false