Web Reference: 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. Variables What is a variable? A variable is a name that Ruby associates with a particular object. For example: city = "Toronto" Here Ruby associates the string "Toronto" with the name (variable) city. Think of it as Ruby making two tables. One with objects and another with names for them. This tutorial aims to help you understand the different types of variables and how to read/write to them from within or outside that class.
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