JavaScript Default Parameters: Fix 'undefined' Errors (ES6 Tutorial 2026)
Are your JavaScript functions returning undefined? Learn how to use ES6 Default Parameters to initialize your function arguments with fallback values. This is a must-know technique for writing cleaner, more robust JavaScript code.
In this tutorial, we cover:
[00:00] Introduction to ES6 Default Parameters
[00:29] Why use default parameters?
[00:39] Creating a function with default values
[01:50] How to invoke functions with one vs two parameters
[02:30] Seeing the result: How default values work
[02:58] Overriding default parameters in your code
[04:50] Summary and Conclusion
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