How to compare two NSDecimalNumber values

Recently I had to use NSDecimalNumber objects to avoid the rounding errors that come with float values. While comparing two float values is as easy as it gets comparing two NSDecimalNumbers works a bit different:

NSDecimalNumber is a subclass of NSNumber so you have to use NSNumber’s compare: method to compare the values:

NSDecimalNumber *number1 = [NSDecimalNumber numberWithFloat:0.1];
NSDecimalNumber *number2 = [NSDecimalNumber numberWithFloat:0.2];

// check if number1 is less than number2
if ([number1 compare:number2] == NSOrderedAscending {
   NSLog(@"number1 is less than number2")
}