the best way to implement readable switch case with strings in objective-c?

Question

In other dynamic languages like ruby, javascript etc. you can do simply this:

switch(someString) {
    case \"foo\":
       //do something;
       break;
    cas         


        

Answer 1

NSString * extension = [fileName pathExtension];
NSString * directory = nil;

NSUInteger index = [@[@"txt",@"png",@"caf",@"mp4"] indexOfObjectPassingTest:^
                    BOOL(id obj, NSUInteger idx, BOOL *stop)
{
    return [obj isEqualToString:extension];
}];

switch (index)
{
    case 0:
        directory = @"texts/";
        break;
    case 1:
        directory = @"images/";
        break;
    case 2:
        directory = @"sounds/";
        break;
    case 3:
        directory = @"videos/";
        break;
    default:
        @throw [NSException exceptionWithName:@"unkonwnFileFormat"
                                       reason:[NSString stringWithFormat:@"zip file contain nknown file format: %@",fileName]
                                     userInfo:nil];
        break;
}