What is this objective-c syntax -

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this question has answer here:

what caret (^) here , doing ?

- (nsuinteger)hash {   return [self.name hash] ^ [self.birthday hash]; }

it's bitwise exclusive or. it's not objective-c, it's plain old c. compares bits of both items give , returns value 1s bits 1 in 1 of items not other.

if have 2 numbers:

5  (00000101) 11 (00001011)

the bitwise exclusive or yield result:

14 (00001110)

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