Objects in Ruby have some methods for rendering into another type, such as:
to_s : convert to string to_a : convert to array to_i : convert to integer to_f : convert to float But there is no standard method for converting an object to boolean, nor in the Object class. How to do this conversion?
The idiomatic way of converting an object of any type to boolean in Ruby is by using a double negation (also called a double bang in the Ruby community):
def to_b(obj)
!!obj
end
The double negation does not affect the value, such that:
!!true => true
!!false => false
Remember that in Ruby, everything is true, except nil and false . Therefore:
"olá".to_b => true
0.to_b => true
"".to_b => true
true.to_b => true
nil.to_b => false
false.to_b => false