JavaScript Parameters, Arguments, Default & Rest Parameters

📰 Dev.to · Megalraja

Learn the difference between JavaScript parameters and arguments, and how to use default and rest parameters to write more flexible functions

beginner Published 27 Sept 2026
Action Steps
  1. Define a function with parameters using the function keyword
  2. Pass arguments to a function when calling it
  3. Use default parameters to assign a value to a parameter if no argument is passed
  4. Apply rest parameters to handle a variable number of arguments
  5. Test functions with different parameter and argument combinations to understand the differences
Who Needs to Know This

Junior developers and coding students can benefit from understanding the basics of JavaScript functions, while senior developers can use this as a refresher to improve their code quality and readability

Key Insight

💡 Parameters are defined in the function signature, while arguments are passed when calling the function

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🚀 Master JavaScript parameters, arguments, default & rest parameters to write more flexible functions! #JavaScript #Functions

Full Article

When I started learning JavaScript functions, I kept mixing up parameters and arguments. Then I came...
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