Скачать или смотреть Master JavaScript indexOf() in 60 Seconds

indexOf() in JavaScript looks simple — but it hides some tricky behaviors that can easily trip you up! 😱

In this short, we’ll dive deep into how indexOf() works in JavaScript strings, how it actually searches for substrings, and how the optional starting position parameter changes your results completely.

You’ll learn:
✅ What indexOf() does behind the scenes
✅ The difference between indexOf() and includes()
✅ Why indexOf() returns -1 and what that really means
✅ Common mistakes beginners make while checking substring existence
✅ How to handle case sensitivity and search positions correctly

By the end, you’ll know exactly how to use indexOf() like a pro and never fall for those sneaky bugs again! 🚀

Perfect for JavaScript beginners, web developers, and anyone improving their string manipulation and search techniques in JS.

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‪@MrBeast‬ ‪@ezsnippat‬ ‪@dutck875.‬