Web Reference: 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. Mar 26, 2026 · Ruby’s variable system gives you five scopes — local, instance, class, global, and constant — each suited to different problems. Constants use UPPER_CASE, everything else uses snake_case. Ruby syntax cheat sheet covering variables, data types, operators, strings, conditionals, loops, methods, blocks, classes, and modules. A concise Ruby basic syntax reference for everyday use.
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