When our good friends in the Google Tag Manager developer team first introduced the Lookup Table Macro, we were excited. For many of us, it soon became the weapon of choice especially when used as a management and optimization tool for the container itself. However, the macro wasn't considered perfect. In fact, the most frequently heard request had to do with the core functionality of the feature itself: the macro should support operations, that is, predicate logic.
Having just come hot of the press with my latest article on GTM and Content Grouping which, to my delight, Bounteous had written an amazing tutorial on earlier, Brian Kuhn and the amazing Google Tag Manager development team came out with another incredible new feature: The Lookup Table Macro. In software engineering, a lookup table is an array which takes away a layer of complexity in runtime computation, and replaces it with a simple value assignment based on array indexing.