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What are Naming Rules? PascalCase, camelCase, snake_case, kebab-case, UPPER_CASE

  • When using a programming language, refers to the rules used when naming variables, functions, classes, methods, etc.
  • There are rules such as pascalCase, camelCase, snake_case, kebab-case, UPPER_CASE.
  • Because these are frequently used terms, it is good to know these rules.
  • We recommend that you use the rules that match the language you frequently use.
    • In Java, CamelCase must be used, but using SnakeCase makes it difficult for other developers to understand.
    • ex) Incorrect use of fineById as find_by_id

What are Naming Rules?​

PascalCase​

  • PascalCase starts the first letter of each word with a capital letter.
  • The reason it is named Pascal is because it is a convention used in the Pascal programming language.
  • ex) PascalCase, NamingRules
  • Used when naming classes in programming languages ​​such as Python, Java, and JavaScript.

camelCase​

  • camelCase is a method where the first letter of each word except the first word is capitalized.
  • The reason it is named camelCase is because it resembles the shape of a camel's back.
  • ex) camelCase, namingRules
  • Used to name functions and variables in programming languages ​​such as JavaScript, C, C++, and C#.

snake_case​

  • snake_case writes all words in lowercase letters, and separates words with underscores (_).
  • The reason it is named snake_case is because the shape of the underbar is similar to the shape of the body of a snake.
  • ex) snake_case, naming_rules
  • Used to name variables and functions in programming languages ​​such as Python, Ruby, and PHP.

kebab-case​

  • kebab-case writes all words in lowercase letters and separates words with hyphens (-).
  • The reason it is named kebab-case is because it is similar to the shape of a kebab. It resembles meat on a kebab skewer.
  • ex) kebab-case, naming-rules
  • In programming languages, hyphens (-) are not often used in variable names, but are used in folder names, file names, etc.

UPPER_CASE​

  • UPPER_CASE is a method where all words are written in capital letters and words are separated by underscores (_).
  • ex) UPPER_CASE, NAMING_RULES
  • Used to express constant variables, which are values ​​that do not change in most programming languages.