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Code for an event driven data layer

Event driven data layer - how can you trigger actions on a data layer push?

Only when I started working with Adobe Launch - which was before there were event driven data layer (EDDL) Launch extensions - I started to realise how good Google Tag Manager's (GTM) data layer is.

Launch offered a solution that relied on polling and that did not impress me, as I knew Google Tag Manager's data layer event trigger fired immediately. Which is what brought me to the question: how can you trigger actions on a data layer push?

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