Ruby naming rules

The Ruby language should start with the most basic learning. Even if we have the foundation of other programming languages, we can't help but focus on the knowledge cited in Ruby. Here we will introduce some concepts of Ruby identification names.

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Ruby identifiers are used to point to constants, variables, methods, classes, and modules. The first letter of the identifiers helps us determine the scope of the content that the identifiers direct.

Ruby identification names are case sensitive.

The Ruby Identification name uses a convention to help it differentiate the usage of a name:

A) the first character before the name indicates the usage of the name.

B). The local variables, method parameters, and method names should start with a lowercase letter or an underline.

C) The global variable uses the dollar sign as the prefix $.

D) instance variables start.

E). class variables start.

F). The class name, Module name, and constant should start with an uppercase letter.

Ruby identifies any combination of letters, numbers, and underscores after the first letter of a noun;

@ Cannot be followed by numbers directly.