You just got back a 300-line API response. Somewhere inside three levels of nesting is the email field you actually need. So you write a loop, then another loop, then a conditional — and now you're maintaining brittle traversal code that breaks every time the API schema shifts. There's a better way: JSONPath. JSONPath is a query language for JSON, similar to how XPath works for XML. Instead of wri
Random 30–50ms freezes with no obvious long tasks in the Performance panel often have one root cause: the garbage collector. V8 pauses JavaScript execution to reclaim memory, and if your allocation rate is high enough, those pauses happen frequently — creating jank that shows up as a sawtooth pattern in the memory timeline rather than a spike in the flame chart. What this covers: How V8's generati
The real pain point Most OAuth/OIDC integrations in JavaScript are difficult to test in a meaningful way. Testing usually involves mocking network calls, faking redirects, stubbing token responses, and simulating browser state. The result is that you are not testing OAuth. You are testing your mocks. The typical test for an OIDC login flow looks something like this: intercept the fetch call to t
[04] The 90/10 Portfolio — Dividend Core + Growth Satellite with a Live Simulator This is Part 4 of a 6-part series: Building Investment Systems with Python In the manifesto, I described a 90/10 portfolio philosophy: 90% in dividend-growing core positions, 10% in a deep-value satellite aiming for 3-5x. Today we build both sides — the dividend snowball model for the core, and a live interactive s
Most AI prompts for developers are useless. Not because the AI is bad - because the prompt is vague. "Review my code" gets you generic feedback. "Act as a senior engineer" gets you a persona, not a result. The prompts below are from the Prompt Playbook, a collection built around one principle: tell the model exactly what to check, in what order, with what output format. That specificity is what se
React State Feels Simple — Until It Doesn't React state management often feels more complex than it needs to be. Selectors, memoization, dependency arrays… how state updates, not just what the state is. Recently, I tried Valtio — and it made me rethink some of these patterns. In many React setups, especially as apps grow, state logic tends to spread: UI state and business state get mixed we add
1. The Hook 2. The Problem 3. The 'StackByUjjwal' Solution // 📁 db-service.js import { createClient } from '@supabase/supabase-js' // Initialize the PostgreSQL connection via Supabase const supabaseUrl = '[https://your-project-id.supabase.co](https://your-project-id.supabase.co)' const supabaseKey = 'YOUR_ANON_KEY' const supabase = createClient(supabaseUrl, supabaseKey) // Fetching Relational D
TestSprite: Review Teknis Mendalam untuk Developer Indonesia Pendahuluan Sebagai developer yang menangani proyek dengan requirement testing yang kompleks, saya selalu mencari solusi automation yang tidak hanya menghemat waktu tetapi juga mengurangi technical debt dari flaky tests. TestSprite muncul sebagai platform menarik dengan AI-powered test generation. Setelah evaluasi menyeluruh