method-declaration – Tarik Billa

Java “params” in method signature?

December 24, 2022 by Tarik

In Java it’s called varargs, and the syntax looks like a regular parameter, but with an ellipsis (“…”) after the type: public void foo(Object… bar) { for (Object baz : bar) { System.out.println(baz.toString()); } } The vararg parameter must always be the last parameter in the method signature, and is accessed as if you received … Read more

What do the plus and minus signs mean in Objective-C next to a method?

October 18, 2022 by Tarik

+ is for a class method and – is for an instance method. E.g. // Not actually Apple’s code. @interface NSArray : NSObject { } + (NSArray *)array; – (id)objectAtIndex:(NSUInteger)index; @end // somewhere else: id myArray = [NSArray array]; // see how the message is sent to NSArray? id obj = [myArray objectAtIndex:4]; // here … Read more