Equality comparisons in RubyEdit

Being relatively new to Ruby I am constantly forgetting the differences between the different kinds of equality comparisons, so here is a quick "cheat sheet":

• == and !=: Determine equivalence of values ("do these two objects have the same value")?

That is: 1.0 == 1 is true even though one is a Float and the other is a Fixnum.

• eql? is stricter, requiring the objects to be of the same class to pass.

So: 1.0.eql? 1.0 is true but 1.0.eql? 1 is false.

• equal? is the strictest of all, requiring the two objects to be the exact same instance (have the same object_id).

So: 1.0.equal? 1.0 is false and 1.equal? 1 is only true because Ruby re-uses the same Fixnum instance for 1 and 1 as an optimization.