Word Frequency | Print Numbers with Delay | Array.map Polyfill — JS Machine Coding Round (Episode 2)

Описание: Welcome to Episode 2 of the JavaScript Machine Coding Round series on Code My Hobby!
In this episode, I solve three real interview-style JavaScript problems commonly asked in service-based IT companies like TCS Digital, Infosys SP, Accenture, Cognizant, LTIMindtree, Tech Mahindra, and more.

🔥 What We Solve in Episode 1
1️⃣ Core Logic Problem — Word Frequency Counter

Learn how to break a sentence into words, normalize text, loop through values, and generate a frequency map using JavaScript objects.

2️⃣ Async JavaScript — Print Numbers 1 to 5 with Delay

Understand how to build a custom wait() function, use async/await, and print numbers sequentially with a 1-second gap.

3️⃣ Polyfill — Array.prototype.map()

Write your own version of Array.map() from scratch, learn how internal callbacks work, and handle sparse arrays properly.

🧠 Why These Problems Matter

These three problems form the foundation of many service-based company machine coding rounds because they test:

Core JavaScript logic

Async behavior & sequencing

Deep understanding of JS internals

Problem breakdown & clean coding

🚀 What To Expect in This Series

Every episode contains three new problems:
✔ Core Logic
✔ Async Simulation
✔ Polyfill (or advanced core JS concept)

Daily episodes will help you build solid fundamentals and prepare for real interview rounds.

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Let’s learn and grow together — because coding is not just a skill… it’s a hobby! ❤️

— Suraj | Code My Hobby

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