2666. Allow One Function Call | Day 10 – Build a "once" Function in JavaScript

Welcome to Day 10 of the 30 Days of JavaScript challenge! 🚀

Today we solve “2666. Allow One Function Call” from LeetCode. Learn how to create a function wrapper that allows only one invocation and blocks all future calls.

📌 What You’ll Learn in This Video:
✅ How to use closures in JavaScript
✅ Managing state (invoked flag) across function calls
✅ Using Function.prototype.apply() for dynamic arguments
✅ Real-world uses for once() patterns (like initializing SDKs, listeners, etc.)

🔗 LeetCode Problem:
https://leetcode.com/problems/allow-one-function-call

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Keep pushing your JavaScript skills to the next level! 💪

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