Question

I was reading over the Dropbox API and I found this line:

NSString* title = [[DBSession sharedSession] isLinked] ? @"Unlink Dropbox" : @"Link Dropbox";

I’ve never seen that syntax before? What is it called and what does it mean? I can tell what it does just from looking at it but could someone tell me about it?

Answer 1

That is a so-called ternary operator

Ternary operators in C have the following pattern condition ? true-expression : false-expression.

If condition evaluates to YES, then true-expression gets evaluated, otherwise false-expression.

In your particular case title would get assigned to @"Unlink Dropbox" if [[DBSession sharedSession] isLinked] returns YES, otherwise @"Link Dropbox".