Скачать или смотреть Day 73: First Non-Repeating Character Challenge | 100 Days of JavaScript Coding Challenge 🎯

Welcome to Day 73 of the 100 Days of JavaScript Coding Challenge! 🚀
#CodeWithPoonam #100DaysOfCode

📝 Problem Statement:
You are given a string and you need to find the first non-repeating character in that string. If there is no non-repeating character, return null.

Input Examples:
1️⃣ Input: "swiss"
Output: "w"

2️⃣ Input: "aabbcc"
Output: null

3️⃣ Input: "programming"
Output: "p"

💡 Solution Approach
1️⃣ Loop through the string.
2️⃣ For each character, use indexOf and lastIndexOf methods to check if it appears more than once.
3️⃣ If the character appears only once, it’s the first non-repeating character.
4️⃣ If no such character exists, return null.

🔑 Key Concepts Covered:
String traversal with a loop.
indexOf and lastIndexOf string methods.
Conditional checks.

🌟 Test Scenarios:
✅ Strings with non-repeating characters.
✅ Strings with all repeating characters.
✅ Edge case: Single character string.

On Day 73, we focused on solving the problem of finding the first non-repeating character in a string. This is a common problem that tests the efficiency of string operations and understanding of basic string methods in JavaScript.

Keep practicing! 💪

#javascript #Day73 #CodingChallenge #StringOperations
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