JavaScript naming conventions

Variables

• Names are case-sensitive, lowercase and uppercase are different.
• Start variable names with a letter, use camelCase for names.
• Variable names should be self-descriptive, describing the stored value.
• Boolean variables are usually prefixed with is or has.

Functions

• Names are case-sensitive, lowercase and uppercase are different.
• Start function names with a letter, use camelCase for names.
• Use descriptive names, usually verbs in the imperative form.
• Common prefixes are get, make, apply etc.
• Class methods follow the same rules.

Constant

• Names are case-sensitive, lowercase and uppercase are different.
• Define constants at the top of your file, function or class.
• Sometimes UPPER_SNAKE_CASE is used, while other times plain camelCase.

Classes

• Names are case-sensitive, lowercase and uppercase are different.
• Start class names with a capital letter, use PascalCase for names.
• Use descriptive names, explaining the functionality of the class.
• Components, which are used in frontend frameworks follow the same rules.

Private

• Prefix any variable or function with _ to show intention for it to be private.
• As a convention, this will not prevent other parts of the code from accessing it.