Objective-C IF statement with OR condition

objective-c ios

You must compare result of two method calls:

if ([currentElement isEqualToString:@"aaa"] || [currentElement isEqualToString:@"bbb"])

The code you have actually compiles as

if ([currentElement isEqualToString:(@"aaa"||currentElement) isEqualToString:@"bbb"])

that is compiler tries to call non-existing isEqualToString:isEqualToString: method of NSString

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