Check element existance in Geb

In Geb, if you need to check if some element does exists on page or not the best looking way to do it is method isPresent(), so it can be called like:

!notNeededLink.present
otherLink.present

Of course if you plan to check non-existing elements like this they need to be defined as not required and with wait - false. For example:

notNeededLink(to: SomePage, required:false, wait: false) {$('a', text:'Some')}