objective c - Method return values -

objective c docs apple says

for object-oriented constructs of objective-c, such method return values, id replaces int default data type. (for strictly c constructs, such function return values, int remains default type.)

i thought return type , hence value predefined in method signature. give me example on doc refers to?

that line means method written such, would, default, return id:

- init { ... } 

or

+ array { ... } 

versus

- (id)init { ... } 

---

in addition, method written without explicit parameter types take in id objects.

- initwithobject:object { ... } 

is same as

- (id)initwithobject:(id)object { ... }