Question

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What does the question mark and the colon (?: ternary operator) mean in objective-c?

I have seen code where it uses a syntax something like…

someValue = someBoolean ? valueOne : valueTwo;

Or something like this.

I’ve never used this and I’m not sure what it’s called.

Please can someone explain how to use it or provide a link to a resource about it.

Answer 1

It’s ternary opertaor.

It evaluates the someBoolean condition.

If it is true then pass the valueOne to someValue

If it is false then pass valueTwo to someValue

It is equal to:

if(someBoolean)
{
   someValue = valueOne;
}
else
{
   someValue = valueTwo;
}

This is a good link which explains about ternary operator