JavaScript Gotchas - Online training and tips for JavaScript Developers

JavaScript Gotchas

Resources and training for serious developers

JavaScript Gotchas on Udemy

Learn to avoid the most common and sometimes subtle JavaScript errors and write robust code.

Learn from 3+ hours of expert-led demos and presentations in this online course.
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View the Gotchas!

We have identified over 20 common mistakes that new and experienced JavaScript developers make.

View the entire list!

Most common errors include:

  • Gotcha: Variable initialization vs. reinitialization
  • Gotcha: Friendly comparisons vs. exact comparisons
  • Gotcha: Unintended globals with missing var declarations
  • Gotcha: Testing for nothing, confusing null vs. undefined
  • Gotcha: Changed means of this
  • Gotcha: There are no integers