//Sort a set
NSSet *set = [[NSSet alloc] initWithArray:@[@(7), @(4), @(5), @(3), @(9), @(15)]];
//Ascending
NSArray *sorted = [set sortedArrayUsingDescriptors:@[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES]]];
NSLog(@"%@" , sorted);
sorted = [set sortedArrayUsingDescriptors:@[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES selector:@selector(compare:)]]];
NSLog(@"%@" , sorted);
sorted = [set sortedArrayUsingDescriptors:@[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES comparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj1 compare:obj2];
}]]];
NSLog(@"%@" , sorted);
//Descending
sorted = [set sortedArrayUsingDescriptors:@[[[NSSortDescriptor alloc] initWithKey:nil ascending:NO]]];
NSLog(@"%@" , sorted);
sorted = [set sortedArrayUsingDescriptors:@[[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES comparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj1 compare:obj2];
}] reversedSortDescriptor]]];
NSLog(@"%@" , sorted);
sorted = [set sortedArrayUsingDescriptors:@[[[NSSortDescriptor alloc] initWithKey:nil ascending:YES comparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
return [obj2 compare:obj1];
}]]];
NSLog(@"%@" , sorted);
Asides
Installing Nokogiri
Nokogiri is notorious for being annoying to install because it has a couple dependencies. In 1.6, they tried to add the dependencies to the package so they it would just work. I was out of luck on that.
I found a solution that did work.
gem install nokogiri -v '1.6.8.1' -- --use-system-libraries=true --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/libxml2
It uses the system libraries and specifies where to find libxml2.
Xida Zheng 