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What are the differences between "<%" and "<%="? How do you know which to use? I'm teaching myself and one of the tutorials I'm using listed the above symbol sets.

H. Golightly
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You must use <%= %> for instructions whose output you want to display in your view, and use <% %> otherwise.

Ed de Almeida
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<%= %> use to output something <% %> use to add your conditions for example