Web Reference: Mar 26, 2026 · A practical tour of Ruby's five variable scopes, the core type hierarchy, runtime type checking, duck typing, and type conversions. A variable is just a label. It’s a way to give names to things in your Ruby programs. Like the names we give to real-world things. When I say “apple”, you know what I’m talking about. I don’t have to describe it to you. That’s what variables do! And they’re way more useful that you may think. Ruby has three kinds of variables, one kind of constant and exactly two pseudo-variables. The variables and the constants have no type. While untyped variables have some drawbacks, they have many more advantages and fit well with ruby's quick and easy philosophy.
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