Why Programming Needs Its Own Case Styles
Most programming languages don't allow spaces inside identifiers — variable names, function names, and similar constructs generally need to be a single unbroken word. Since natural multi-word names like "user account" can't include a space, programmers developed several conventions for representing multiple words as one continuous identifier while still keeping word boundaries visually readable.
camelCase
The first word is lowercase, and each subsequent word starts with a capital letter, with no separators — userAccountBalance. Common for variable and function names in JavaScript, Java, and many other languages.
PascalCase
Identical to camelCase, except the very first word is also capitalized — UserAccountBalance. Commonly used for class names and type names, distinguishing them visually from variables and functions in the same codebase.
snake_case
Every word is lowercase, separated by underscores — user_account_balance. The conventional style for variable and function names in Python, Ruby, and Rust, among others.
kebab-case
Every word is lowercase, separated by hyphens — user-account-balance. Not valid as an identifier in most programming languages (hyphens are interpreted as subtraction), but common in URLs, CSS class names, and file names, where hyphens are perfectly valid characters.
SCREAMING_SNAKE_CASE
Snake case, but fully uppercase — MAX_RETRY_COUNT. Conventionally used for constants across many languages, signaling at a glance that a value shouldn't be reassigned.
Which One to Use
The right convention depends entirely on the language and codebase you're working in — most languages have a dominant community convention (camelCase for JavaScript variables, snake_case for Python variables, PascalCase for classes across most languages), and consistency with that existing convention matters more than any individual preference.
Need to convert text between these styles?
Open Case Converter