Variable Naming Rules

Variable Naming Rules: The Do’s and Don’ts

JavaScript has specific rules for naming variables. Follow these to avoid errors and write clean code!

What’s Allowed

  • Letters (a-z, A-Z)
  • Digits (0-9)
  • Underscore (_)
  • Dollar sign ($)
  • Must start with a letter, underscore, or dollar sign

Valid Variable Names

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Invalid Variable Names

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Reserved Words to Avoid

  • let, const, var
  • function, return, if, else
  • for, while, do
  • class, import, export

Naming Conventions

  • camelCase: firstName, userAge
  • PascalCase: UserProfile, CarModel
  • UPPER_CASE: MAX_SIZE, PI
  • snake_case: user_name, first_name

Tip: Choose a style and stick to it consistently in your project!