Debugging is the systematic process of locating why a program misbehaves and correcting it. It starts with reproducing the problem and ends with a fix that is verified and, ideally, covered by a test.
Why it matters
Most of a developer's time goes into reading and understanding code, not writing it, so a good debugging method saves hours. Guessing and changing random lines tends to create new bugs. A structured approach finds root causes instead of masking symptoms.
Example
A common method:
- Reproduce the failure reliably and note the exact input.
- Read the error and the stack trace from the bottom of your own code upward.
- Form a hypothesis, such as "the cart is empty when tax is computed".
- Test it with a log line or a breakpoint and inspect variable values.
- Fix the cause, then add a unit test.
Narrowing the range, for example with git bisect, finds the commit that introduced a regression.
Common mistakes
- Changing several things at once so you cannot tell which one mattered.
- Ignoring the first error and chasing later ones that were only side effects.
- Debugging only in production-like data you cannot reproduce locally; capture the failing input instead.
Related
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यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.