Mohsen Fallahnejad

1 min read

Mohsen Fallahnejad

Nov 3

MVVM, Micro‑Frontends, and Domain‑Driven Frontend — A Practical Guide

#architecture #frontend #mvvm #microfrontends

4 min read

Mohsen Fallahnejad

Nov 3

Next.js App Router Caching — Cheat Sheet

#nextjs #caching #approuter #performance

2 min read

Mohsen Fallahnejad

Nov 3

Microtask vs Macrotask in JavaScript — With Node.js vs Browser Notes

#javascript #eventloop #microtask #macrotask

2 min read

Mohsen Fallahnejad

Nov 3

JavaScript Promises Explained

#javascript #async #promise #eventloop

2 min read

Mohsen Fallahnejad

Nov 3

JavaScript Closures — A Simple Deep Dive

#javascript #closures #scope #lexicalenvironment

3 min read

Mohsen Fallahnejad

Nov 3

Prefetching in Next.js Links Explained

#nextjs #link #prefetch #approuter

2 min read

Mohsen Fallahnejad

Nov 3

BroadcastChannel API in JavaScript

#javascript #webapi #broadcastchannel #multitab

2 min read

Mohsen Fallahnejad

Nov 3

React Context Explained: How It Works Under the Hood

#react #context #hooks #statemanagement

3 min read

Mohsen Fallahnejad

Nov 3

React Fiber Explained: How React’s Engine Actually Works

#react #fiber #reconciliation #concurrent

3 min read

Mohsen Fallahnejad

Nov 3

useDeferredValue Explained: Keeping React UIs Responsive

#react #hooks #concurrent #performance

1 min read

Mohsen Fallahnejad

Nov 3

Are TypeScript Enums a Good Idea? (Bundle Size & Runtime)

#typescript #enums #bundlesize #performance

2 min read

Mohsen Fallahnejad

Nov 3

Why async/await Doesn’t Make JavaScript Code Parallel

#javascript #async #await #promises

2 min read

Mohsen Fallahnejad

Nov 3

How Promise.all Works in a Single-Threaded JavaScript World

#javascript #promises #eventloop #async

2 min read

Mohsen Fallahnejad

Nov 3

Web Workers Explained for Frontend Developers

#javascript #webworkers #performance #parallelism

2 min read

Mohsen Fallahnejad

Nov 3

Promise APIs Compared: all vs race vs any vs allSettled

#javascript #promises #async #eventloop

2 min read

Mohsen Fallahnejad

Nov 3

queueMicrotask Explained: The Smallest Async Queue in JavaScript

#javascript #eventloop #microtask #async

1 min read

Mohsen Fallahnejad

Nov 3

CDN Explained: What It Is, How It Works, and How to Use It in Next.js

#cdn #nextjs #performance #frontend

2 min read

Mohsen Fallahnejad

Nov 3

React memo vs useMemo vs useCallback — When to Use Which

#react #performance #hooks #memoization

2 min read

Mohsen Fallahnejad

Nov 3

CORS Explained Simply — Why Your Fetch Works in Postman but Fails in the Browser

#cors #http #security #fetch

5 min read

Mohsen Fallahnejad

Nov 3

?? vs || — The Default-Value Trap That Breaks Real Apps

#javascript #typescript #operators #interview

3 min read

Mohsen Fallahnejad

Nov 3

React useEffect Dependencies — The Bug That Keeps Coming Back

#react #hooks #useeffect #closures

4 min read

Mohsen Fallahnejad

Nov 3

Debounce vs Throttle — One Sentence to Remember Forever

#javascript #performance #debounce #throttle

3 min read

Mohsen Fallahnejad

Nov 3

The Leaderboard That Ranked 9 Points Above 100

#javascript #arrays #sort #gotchas

4 min read

Mohsen Fallahnejad

Nov 3

You Selected Rows 3, 8, 12, 15 and 20. JavaScript Checked 3, 1 and 8.

#javascript #arrays #parseint #gotchas

4 min read

Mohsen Fallahnejad

Nov 3

One Line in My Root Layout Turned 158 Static Pages Into 0

#nextjs #approuter #performance #caching

5 min read

Mohsen Fallahnejad

Nov 3

The Settings Object That Came Back undefined

#javascript #asi #semicolons #syntax

4 min read

Mohsen Fallahnejad

Nov 3

The $4.35 Item That Was Charged $4.34

#javascript #numbers #floatingpoint #money

4 min read

Mohsen Fallahnejad

Nov 3

The Leaderboard Arrived Sorted. JavaScript Re-sorted It by User ID.

#javascript #objects #json #map

4 min read

Mohsen Fallahnejad

Nov 3

Scrolling My Blog Index Prefetched All 51 Posts. One Config Line Cut It to 90 kB.

#nextjs #link #prefetch #performance

4 min read

Mohsen Fallahnejad

Nov 3

The Server Action That Ran Twice, but Only on localhost

#nextjs #react #serveractions #strictmode

4 min read

Mohsen Fallahnejad

Nov 3

useTransition Explained: Make React Feel Instant

#react #hooks #concurrent #performance

3 min read

Mohsen Fallahnejad

Nov 3

JavaScript Generators & Iterators — Lazy Sequences Explained

#javascript #generators #iterators #es6

3 min read

Mohsen Fallahnejad

Oct 31

I Optimized a Button From O(n) to O(1). The Speed Didn't Matter.

#bigo #algorithms #performance #react

8 min read

Mohsen Fallahnejad

Oct 14 '25

Understanding HttpOnly Cookies in Depth

#cookies #security #web #nextjs

2 min read

Mohsen Fallahnejad

Sep 29 '25

Why MUI Avoids Theme Flash on First Load (Dark/Light Mode)

#mui #nextjs #darkmode #hydration

2 min read

Mohsen Fallahnejad

Sep 29 '25

Deep Copy vs Shallow Copy in JavaScript

#javascript #copy #objects #cloning

2 min read

Mohsen Fallahnejad

Sep 29 '25

Why setState Doesn’t Cause Hydration Errors

#react #hydration #setstate #nextjs

2 min read

Mohsen Fallahnejad

Sep 23 '25

JavaScript is Single-Threaded

#javascript #eventloop #async

2 min read

Mohsen Fallahnejad

Sep 23 '25

How useState Works Under the Hood (and Why It Needs use client)

#react #hooks #usestate #nextjs

3 min read

Mohsen Fallahnejad

Sep 23 '25

Next.js Page Router vs App Router

#nextjs #react #routing #frontend

2 min read

Mohsen Fallahnejad

Sep 23 '25

What is 'use client' in Next.js?

#nextjs #react #useclient #servercomponents

2 min read

Mohsen Fallahnejad

Sep 23 '25

AbortController & AbortSignal

#javascript #abortcontroller #abortsignal #fetch

3 min read

Mohsen Fallahnejad

Sep 21 '25

React Higher-Order Components (HOC)

#react #hoc #patterns #frontend

2 min read

Mohsen Fallahnejad

Sep 21 '25

JavaScript Event Bus 🚍 (JS + TypeScript)

#javascript #eventbus #pubsub #architecture

5

3 min read

Mohsen Fallahnejad

Sep 20 '25

JavaScript's Event Loop — Simple Guide (with SVG Timeline)

#javascript #eventloop #async #promises

1 min read

Mohsen Fallahnejad

Sep 17 '25

Frontend Design Patterns — A Practical Guide

#frontend #designpatterns #react #architecture

3 min read

Mohsen Fallahnejad

Sep 17 '25

Git Rebase vs Git Merge — Simple Guide

#git #versioncontrol #rebase #merge

2 min read

Mohsen Fallahnejad

Sep 17 '25

When Should You Use Dynamic Import in React/Next.js? (With Performance Comparison)

#react #nextjs #dynamicimport #performance

2 min read

Mohsen Fallahnejad

Sep 17 '25

React useRef vs useState — When to Use Which

#react #hooks #useref #usestate

2 min read

Mohsen Fallahnejad

Sep 14 '25

SOLID Principles Explained Simply

#solid #principles

2 min read

Mohsen Fallahnejad

Sep 14 '25

Async vs Sync in JavaScript

#javascript #async #sync #basics

1 min read

Mohsen Fallahnejad

Sep 14 '25

Event Bubbling vs Event Capturing in JavaScript

#javascript #events #dom #basics

1 min read

Mohsen Fallahnejad

May 12 '20

filtered list for live search

#javascript #tutorial #webdev #vue

4

1 min read

Mohsen Fallahnejad

Apr 19 '20

Customize .sort() method in JS

#javascript #tutorial #webdev #vue

5

1 min read

Mohsen Fallahnejad

Apr 8 '20

COPY to the clipboard in JS

#javascript #tutorial #webdev #vue

41

1 min read

Mohsen Fallahnejad

Apr 4 '20

Using function in v-model

#vue #tutorial #webdev #javascript

1 min read

Mohsen Fallahnejad

Mar 16 '20

State Switching..!

#javascript #tutorial #webdev #vue

4

2 min read

Mohsen Fallahnejad

Mar 15 '20

How to generate an ID for Array sequentially ?!

#javascript #tutorial #webdev #vue