🚀 JavaScript Practice Questions

Master JS fundamentals before you touch DSA or LeetCode

Do these before LeetCode. Do these before DSA. If you can't swap two numbers or reverse a string confidently — you're not ready for linked lists yet. Start here.

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👋 Why does this repo exist?

Every year, thousands of students learn JavaScript — watch tutorials, follow along with courses — and then open LeetCode or start a DSA playlist and immediately feel lost.

Not because they're not smart. But because they skipped the fundamentals.

Before you worry about Linked Lists, Binary Trees, or Dynamic Programming — you need to be genuinely comfortable with:

• loops, conditions, and functions
• how strings and arrays actually work
• writing logic from scratch, not just reading it

This repo is that missing middle step. 276 questions, written in LeetCode style, covering pure JavaScript fundamentals. No frameworks, no setup — just you and the language.

💡 Think of this as your "pre-DSA checklist" — if you can solve these confidently, you're ready for the harder stuff.

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📚 What's Inside

#	Topic	Questions	File
1	🔤 Variables & Data Types	Q1 – Q10	01-variables-and-data-types.md
2	➕ Operators	Q11 – Q20	02-operators.md
3	🔀 if / if-else	Q21 – Q35	03-if-and-if-else.md
4	🪜 if-else-if Ladder	Q36 – Q45	04-if-else-if-ladder.md
5	🔁 switch Statement	Q46 – Q55	05-switch-statement.md
6	🔄 for Loop	Q56 – Q80	06-for-loop.md
7	⏳ while & do-while Loop	Q81 – Q101	07-while-and-do-while.md
8	⛔ break & continue	Q102 – Q121	08-break-and-continue.md
9	🔲 Nested Loops & Patterns	Q122 – Q136	09-nested-loops-patterns.md
10	🧩 Functions	Q137 – Q156	10-functions.md
11	🔡 Strings	Q157 – Q181	11-strings.md
12	📦 Arrays	Q182 – Q211	12-arrays.md
13	🛠️ Array Methods	Q212 – Q237	13-array-methods.md
14	🗂️ Objects, Set, Map & Recursion	Q238 – Q276	14-objects-set-map-recursion.md

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🎯 Difficulty Breakdown

🟢 Easy      ████████████████████░░░  ~220 questions
🟡 Medium    ████░░░░░░░░░░░░░░░░░░░   ~45 questions
🔴 Hard      █░░░░░░░░░░░░░░░░░░░░░░   ~11 questions

Hard problems are kept minimal — the goal is to build a rock-solid foundation, not to overwhelm you.

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🗺️ Suggested Learning Path

Follow this order — each topic builds on the previous one:

Variables & Data Types
      ↓
  Operators
      ↓
if / if-else / switch
      ↓
Loops (for → while → do-while)
      ↓
break / continue / Nested Loops & Patterns
      ↓
Functions
      ↓
Strings
      ↓
Arrays → Array Methods
      ↓
Objects → Set → Map
      ↓
Recursion  ← once you're here, you're ready for DSA 🎉

Once you finish this list, you'll have the mental model to tackle Data Structures and Algorithms with confidence. Loops and strings alone will make up 60% of your early DSA problems — master them here first.

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🍴 How to Use This Repo

Simple rule: start from Q1 and go in order. Each section builds on the previous one — don't skip around.

🆕 New to git? Use Option 1 for now — come back to Option 2 once you're comfortable.

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Option 1 — Just Browse on GitHub

Read any .md file directly on GitHub. No setup needed. Pick a question, open your editor or an online platform, and solve it.

To run your code — use VS Code, your browser console (F12), or any online JavaScript runner you prefer.

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Option 2 — Clone & Solve in VS Code (Recommended ⭐)

Step 1: Fork this repo

Click the Fork button at the top-right of this page. This creates your own personal copy on your GitHub.

Step 2: Clone your fork

git clone https://github.com/aman-sinha-dev/javascript-practice-questions.git
cd javascript-practice-questions

Step 3: Create your solutions/ folder

This is your personal workspace — organize it however you like:

javascript-practice-questions/
├── solutions/                  ← create this folder
│   ├── 01-variables.js
│   ├── 02-operators.js
│   ├── 06-for-loop.js
│   └── ...
├── 01-variables-and-data-types.md   ← read questions here
├── 02-operators.md
└── ...

Step 4: Open in VS Code and start from Q1

code .

Open 01-variables-and-data-types.md, read Q1, create solutions/01-variables.js, and write your answer. Then move to Q2. Simple as that.

Step 5: Save your progress with git

git add solutions/
git commit -m "solved: Q1-Q10 variables section"
git push origin main

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💡 Tips for Beginners

• ✅ Don't rush. Doing 3 questions well beats doing 10 questions poorly.
• ✅ Try without hints first. Even if you're stuck for 20 minutes — that struggle builds the skill.
• ✅ Write it out, don't copy. Typing code yourself is how it actually sticks.
• ✅ Google is allowed. Knowing how to search is also a skill. Just don't paste solutions blindly.
• ✅ Revisit questions. Come back to problems you found hard — you'll be surprised how easy they feel later.

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🤝 Contributing

Found a typo? Want to add a better example? Have a cleaner way to phrase a question?

PRs are welcome!

# 1. Fork the repo (click Fork on GitHub)
# 2. Clone your fork
git clone https://github.com/aman-sinha-dev/javascript-practice-questions.git

# 3. Create a branch
git checkout -b fix/question-47-typo

# 4. Make your changes

# 5. Push and open a PR
git push origin fix/question-47-typo

Please do not add solution files to the main question files — keep questions and solutions separate.

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⭐ Show Some Love

If this helped you, consider giving the repo a star ⭐ — it helps other students find it too.

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The best time to build fundamentals is before you need them.

Practice here. Then go conquer DSA. 💪

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Made with ❤️ by Aman Sinha — for every student who felt lost before finding this.