Freemarker assign list length to local variable

Question

The following freemarker code causes an exception

<#assign i= it.getList().size()>
<#list it.getList() as elem>
    <#if i==1>
    
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Answer 1

I figured out, that it did not understood the syntax for the size built-in. The right syntax for assigning the size of a list to a local variable is

<#assign i = it.getList()?size>