Web Reference: Feb 12, 2026 · In this lesson, we will return to the subject of debugging JavaScript (which we first looked at in What went wrong?). Here we will delve deeper into techniques for tracking down errors and explain how to code defensively and handle errors in your code, avoiding problems in the first place. Debugging for Beginners Many beginners quit because they cannot debug. This page shows you how to find out why code does not work. Debugging means finding and fixing mistakes (bugs) in your code. Bugs are normal. The skill is learning how to locate them quickly. The most common use of tap is actually for debugging. You can place a tap (console.log) anywhere in your observable pipe, log out the notifications as they are emitted by the source returned by the previous operation.
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