Django, React, Flutter, Python scripting and more
66 articles
Many developers assume that fetch() throws an error whenever an API request fails. In reality, fetch only rejects promises for network-level failures, allowing HTTP errors like 404 and 500 responses to slip through unnoticed. Learn why bad responses are often silently swallowed and how to build..
Bulk inserts combined with PostgreSQL's ON CONFLICT DO NOTHING can dramatically improve performance and simplify deduplication. However, many developers are surprised when rows silently disappear during large imports. Learn why missing rows occur, how SQLAlchemy handles conflicts, and how to safely
Django QuerySets are lazily evaluated and internally cached, which can significantly improve performance. However, misunderstanding how QuerySet caching works can lead to stale data appearing in views, APIs, and background tasks. Learn why this happens and how to prevent it.
N+1 query bugs in Django serializers can silently turn a fast endpoint into a database-hammering bottleneck. Learn how to detect them with django-debug-toolbar and nplusone, then fix them permanently with select_related and prefetch_related.
As Flutter applications grow, poor project organization can quickly lead to technical debt, duplicated code, and difficult maintenance. Learn how to structure large Flutter applications using feature-based architecture, Clean Architecture principles, dependency injection, state management..
Your Django signal handler is running twice, three times, or more — and you have no idea why. This guide breaks down every common cause, from duplicate receiver registration to AppConfig mistakes, and shows you exactly how to stop it.
If your FutureBuilder keeps restarting its Future on every parent rebuild, your data re-fetches on every keystroke, scroll, or tap. Here's why it happens and exactly how to stop it.
React Context is convenient until it starts re-rendering every consumer on every tiny state change. Learn exactly why this happens and the practical patterns you can use to stop it dead in its tracks.
Seeing 'setState called after dispose' crash your Flutter app? This error trips up developers at every level. Here's exactly why it happens, when it's silent, and the patterns that stop it for good.
Many Python developers are surprised when Excel formulas written with openpyxl show outdated results even after saving the workbook. Learn why stale formula values occur, how Excel calculates formulas, and the best ways to ensure accurate spreadsheet results.
Memory leaks in long-running Python applications can slowly degrade performance and eventually crash services. Learn how to use Python's built-in tracemalloc module to identify memory growth, locate problematic allocations, and fix leaks before they impact production.
Many JavaScript developers are surprised when Array.sort() produces unexpected ordering for numbers. Learn why the default sorting behavior works this way, how compare functions solve the problem, and best practices for reliable sorting.