Underscore.php is library of higher-order functions, such as, map, reduce, and filter. It provides functional style programming for, potentially, a myriad of potential uses in the context of Rules:

More importantly than the actions and conditions provided from implementing this library are the components that will be shared, based on them.

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Background info on Underscore.php:

Comments

mitchell’s picture

mitchell CreditAttribution: mitchell commented
Title: User Underscore.php for data and list operations » Use Underscore.php for data and list operations
dreftymac’s picture

dreftymac CreditAttribution: dreftymac as a volunteer commented

+1

TR’s picture

TR CreditAttribution: TR commented
Version: 7.x-2.x-dev » 8.x-3.x-dev
Status: Active » Postponed

This is not going to happen unless someone contributes code. An ideal way to do that would be to create your own module which adds this feature to Rules. Then, if people find that module useful, we can discuss including its functionality in core Rules. Regardless, there are not going to be any major new features introduced into D7 Rules this late in the D7 development cycle. New features will go into D8.

TR’s picture

TR CreditAttribution: TR commented
Status: Postponed » Closed (outdated)

It seems https://github.com/brianhaveri/Underscore.php hasn't had any commits for almost 8 years.

Also, there has been essentially no interest expressed by the community in seeing this feature added.

So I think it's appropriate to close this, since to add this sort of functionality we would have to start from square one again, identify the functionality needed, identify current code (if any) that can help us implement that functionality, then actually do the implementation for Rules.