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