🐫➡️🐍 Converting camelCase to snake_case in JavaScript (Without Regex)
Category: js / utils
Difficulty: easy
In the world of code conventions, case styles are more than aesthetics — they're contracts. JavaScript favors camelCase, while many APIs, databases, and configuration files lean on snake_case. Converting between them is a common task — and yes, regex is usually the weapon of choice. But what if you want clarity, control, or speed, and no regex? Let's walk through an elegant, loop-based solution. 🧠 The Problem We want to convert this: [code example] Into this: [code example] Without using .replace() or regular expressions. 🚫 The Regex Way (Just for Comparison) [code example] Great, but regex has downsides: Black-box behavior Poor readability Harder to debug Slower on large strings Let's throw it out and do it manually. ✅ The Loop-Based Approach [code example] 🧪 Example: [code example] 🤔 What About Acronyms? That naive version splits every uppercase letter — which can shred acronyms into noise. Let's fix that with a smarter variant: [code example] 🔍 Behavior: [code example] We only insert underscores between lowercase–uppercase transitions, preserving acronyms....