Twig blocks are like methods in a class.  If the Twig container is a class, Twig blocks are methods.  So you can call on a parent Twig view and extend the parent just like a function using the “parent()” function like below within the dynamic content tags, which are a pair of squiggly brackets.  Here’s an example of how you can extend a parent’s block from a child view.

{% extends “MainBundle::Base:main.html.twig” %}

{% block Css %}
   {{ parent() }}
   <link rel="stylesheet" href="addUniqueStylesheetForThisView.css">
   <link rel="stylesheet" href="addAnotherStylesheet.css">
{% endblock %}

Without using “parent()” above, this child “Css” block will completely override the parent’s Css block.  As the title states, this is easy, useful and helps your code stay “DRY” – Don’t Repeat Yourself.

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