Why do we need Map and Set in JavaScript when we already have Arrays and Objects? What do they bring to the table?

I'm currently learning JavaScript and recently came across the Map and Set data structures. I understand that Set stores unique values and Map stores key-value pairs, but I'm wondering what advantages they actually provide over the existing Array and Object structures. What are some practical situations where you would choose Map or Set instead of an Array or Object? I'd especially appreciate real-world examples that make the differences clear. submitted by /u/hamzafullstack [link] [留言]