CODEWITHSUNDEEP
objective-cnsnumber
user6631314
user6631314

Reputation: 1980

Using isEqual to test equality of NSNumber

I was under the impression that to test the value of an NSNumber you may use isEqual:

However, when I test the value of an NSNumber with an integer value of 38 using the following code, I am getting false instead of true. Is there a subtlety to this that I am missing?

if ([self.adding isEqual:@38]) {
//they are equal
}
else {
//they are unequal
}

Of note, when I use if ([self.adding intValue]==38), I do get the expected result.

In the debugger the NSNumber shows as int(38).

Upvotes: 0

Views: 230

Answers (1)

Ben Zotto
Ben Zotto

Reputation: 71088

Use -isEqualToNumber: for a numeric equality test, which is itself tied to the -compare: method's notion of equality.

(NSNumber is implemented as a class cluster. The guts of the -isEqual: method are likely looking at additional subtleties like whether the two instances are from the same actual type or whatever, which might be significant when dealing with storage in a collection but don't help you check for the 38. This is the same reason you should use NSString's -isEqualToString: method for the equivalent comparison).

Upvotes: 1

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