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@implemenetation Triangle ... -(void)setAngles:(NSArray *)_angles { self.angles = _angles; NSAssert((self.angles.count == 3), @"Triangles must have 3 angles. Array '%@' has %i", self.angles, (int)self.angles.count); CGFloat angleA = [self.angles[0] floatVal...

Exceptions represent programmer-level bugs like trying to access an array element that doesn’t exist. Errors are user-level issues like trying load a file that doesn’t exist. Because errors are expected during the normal execution of a program. Example: NSArray *inventory = @[@"Sam"...