I have references to 'ground' and 'air' in multiple files. It is usually used
in this context, but not always.
> if ([transport.type isEqualToString:@"ground"]) {
> // do something for automobiles
> }
> else if ([transport.type isEqualToString:@"air"]) {
> // do something else for planes
> }
> else {
> // we don't care
> }
Should I be using string constants to represent 'ground' and 'air' so if I ever
change their literal, I just update it in one place? e.g.
> NSString * const TransportGround = @"ground";
> NSString * const TransportAir = @"air";
I then decide I want to rename 'ground' to be 'wheels', then I would only
update the above string constant.
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