Web Reference: Sep 25, 2019 · Global variable are always prefixed with a dollar sign ($). If we want to have a single variable, which is available across classes, we need to define a global variable. A global variable has a name beginning with $. It can be referred to from anywhere in a program. Before initialization, a global variable has the special value nil. ... Global variables should be used sparingly. They are dangerous because they can be written to from anywhere. Jul 22, 2015 · Variable scope in Ruby is controlled by sigils to some degree. Variables starting with $ are global, variables with @ are instance variables, @@ means class variables, and names starting with a capital letter are constants. All other variables are locals.
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