Since the URLs and strings are immutable, I think we could

```objc
NSArray *URLStrings = @[
    @"https://github.com",
    @"https://github.com/MantleFramework",
    @"https://apple.com]
];

NSArray *URLs = @[
    [NSURL URLwithString:@"https://github.com"],
    [NSURL URLwithString:@"https://github.com/MantleFramework"],
    [NSURL URLwithString:@"https://apple.com"]
];
```