How to remove an element from an array in Swift: complete guide

Hello everyone! I just started learning Swift and encountered a problem when working with arrays. I need to remove elements from an array depending on different conditions, but I can't find the right way.\n\nI have an array of strings with usernames:\n\n```swift\nvar users = ["Alice", "Bob", "Charlie", "David", "Eve"]\n```\n\nI want to:\n1. Remove a specific user by name (e.g., "Charlie")\n2. Remove the first or last element\n3. Remove an element by index\n4. Remove multiple elements at once\n\nI tried using the `remove(at:)` method, but it requires an index, not a value. I tried to find the index via `firstIndex(of:)`, but I'm not sure if I'm doing it correctly. I also saw `removeAll` in the documentation, but it removes all elements, and I only need to remove some.\n\nPlease advise.