API / Apache FreeMarker Interview questions

How do you create a user-defined macro using #macro?

<#macro name param1 param2=default> ... </#macro> defines a reusable block of template markup, written entirely in FTL, that can accept parameters, including optional ones with default values.

<#macro button label href target="_self">
  <a href="${href}" target="${target}" class="btn">${label}</a>
</#macro>

<@button label="Docs" href="/docs"/>

A macro can also wrap arbitrary nested content and render it back out with the <#nested> directive, which is how a macro can act like a layout container rather than just a parameterized snippet:

<#macro card>
  <div class="card"><#nested></div>
</#macro>

<@card>This content is nested inside the card.</@card>

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How is a defined macro invoked in a template?With the @ sigil, e.g. <@button label="Docs"/>

✓ Correct! Well done.

By calling it like a Java method: button("Docs")

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With #call button

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Macros run automatically without being invoked

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Which directive lets a macro render whatever content was nested between its opening and closing tags?<#return>

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<#nested>

✓ Correct! Well done.

<#body>

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<#include>

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Recently added questions

What is the purpose of interpolation (${...}) in FreeMarker? List the comparison operators supported in FreeMarker? What are the main use cases of FreeMarker? What are the types in FreeMarker's data model? How do you use the #assign directive? Describe the built-ins available in FreeMarker? How do you access static Java members (static methods, fields, and enum constants) from a FreeMarker template? What is Apache FreeMarker? What is the purpose of the FreeMarker Configuration object? What is the difference between FreeMarker's #switch/#case and a chain of #if/#elseif directives? What is the purpose of the <#if> directive? What are the types of loops available in FreeMarker? What is the difference between #assign and #local? How do you apply default values for missing variables in FreeMarker? Why doesn't FreeMarker allow templates unrestricted access to Java reflection and side-effecting method calls? What is the purpose of the incompatible_improvements setting? Define directive in FreeMarker? Which is generally the better choice for a new project today, FreeMarker or Velocity, and why? What is a FreeMarker template? What is the purpose of the #include directive?

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