GSP also supports logical and iterative tags out of the box. For logic there are if, else and elseif which support your typical branching scenarios:

<g:if test="${session.role == 'admin'}">
   <%-- show administrative functions --%>
</g:if>
<g:else>
   <%-- show basic functions --%>
</g:else>

For iteration GSP has the each and while tags:

<g:each in="${[1,2,3]}" var="num">
   <p>Number ${num}</p>
</g:each>

<g:set var="num" value="${1}" /> <g:while test="${num < 5 }"> <p>Number ${num++}</p> </g:while>