The what?

We sometimes write code like:

NSString* someValue;
//...
NSString* val;
if (someValue) {
    val = someValue;
} else {
    val = @"some default";
}

or similarly, using the tenary operator:

NSString* someValue;
//...
NSString* val = someValue? someValue: @"some default";

You can leave out the middle operand of the tenary operator like this and it'll work as before:

NSString* someValue;
//...
NSString* val = someValue?: @"some default";

This special form of the tenary operator is known as the null coalescing operator in some languages.

Your feedback is valuable: Do you want more nuggets like this?   Yes   or   No