Snake case

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Snake case (or snake_case) is the practice of writing compound words or phrases in which the elements are separated with one underscore character (_) and no spaces, with each element's initial letter usually lowercased within the compound and the first letter either upper or lower case—as in "foo_bar" and "Hello_world". It is commonly used in computer code for variable names, and function names, and sometimes computer filenames.[1] At least one study found that readers can recognize snake case values more quickly than CamelCase.[2]


When each word is delimited by a hyphen instead of an underscore, the practice is popularly known as kebab-case or lisp-case; also, the uppercased initial word character variant is known as Train-Case, and the all lowercased variant is known as spinal-case.[3][4] Screaming snake case is similar to snake_case, with letters written in UPPERCASE, as in: THIS_IS_AN_EXAMPLE.

Languages that use snake case as convention[edit]

  • OCaml for variable and function names
  • C++
  • Erlang, for function names
  • Perl
  • Python, for variable names, function names, and method names
  • Ruby
  • Rust, for variable and function names[5]
  • Elixir, for variable and function names[6]

See also[edit]