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Before we dive into today’s article, here are two powerful collections to spark your next build, launch, or side hustle:
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Whether you're fresh out of a bootcamp or a seasoned dev who feels like they're writing the same 20 lines on repeat, this list is going to hit differently. These aren't the generic "use map()
instead of forEach()
" tips — these are under-the-radar, sanity-saving patterns and mental models that experienced devs use but rarely explain.
1. 🧯 Stop Over-Nesting with Short-Circuit Guards
Instead of this:
if (user) {
if (user.settings) {
if (user.settings.darkMode) {
enableDarkMode();
}
}
}
Do this:
user?.settings?.darkMode && enableDarkMode();
Even better: Flip it early and bail.
if (!user?.settings?.darkMode) return;
enableDarkMode();
This reduces cognitive overhead and makes your logic flow clear and direct.
2. 🧼 Object.fromEntries()
Is Your Map Cleaner
Ever built a new object from an array using reduce? No more.
const entries = [["name", "Asmodeos"], ["power", 9001]];
const obj = Object.fromEntries(entries);
Combine it with Object.entries()
for powerful object transforms:
const updated = Object.fromEntries(
Object.entries(obj).map(([k, v]) => [k, String(v).toUpperCase()])
);
3. 🧪 Sneaky Assertion Functions = Saner Debugging
Inject sanity into chaotic codebases:
function assert(condition, message = "Assertion failed") {
if (!condition) throw new Error(message);
}
Usage:
assert(user, "User must be defined here");
You’ll debug faster and catch bad assumptions early.
4. 🧬 Destructure Like a Pro — with Defaults
This isn't just clean syntax — it saves bugs.
function greet({ name = "Stranger", mood = "neutral" }) {
console.log(`Hi ${name}, you're feeling ${mood}?`);
}
Calling greet({})
won’t crash or log undefined
.
5. 🔁 Named Function Expressions > Anonymous Callbacks
Compare:
setTimeout(function () {
// ?? who am I?
}, 1000);
With:
setTimeout(function handleTimeout() {
// easy to find in stack trace
}, 1000);
Named functions give you better stack traces, easier debugging, and better documentation for yourself 6 months from now.
6. 🧊 Freeze Configs to Avoid Mutation Mayhem
When passing around config objects, lock them up:
const config = Object.freeze({
theme: "dark",
retries: 3
});
Now accidental overwrites will throw errors in strict mode — a life-saver when working in teams or large codebases.
7. 📎 Save Yourself with Function .name
and .toString()
Need to debug unknown functions passed into a system?
function logFunctionInfo(fn) {
console.log(`Function name: ${fn.name}`);
console.log(`Source:\n${fn.toString()}`);
}
Useful for dynamic code and tracking behaviors in callback-heavy apps.
🚀 TL;DR
These tricks aren't about writing less code — they're about writing code with more intent. Every dev has their bag of little-known tools. Hopefully, these gave you a few new ones to sharpen your blade.
💬 What’s One Trick You Swear By?
Drop your favorite under-the-radar JavaScript move in the comments. Let’s turn this listicle into a treasure chest.
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Want to stop scrolling and start building with ready-to-use open-source projects?
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Here’s one you can start exploring right away: