How to render in eleventy 11ty njk template a default value if null value

In Eleventy (11ty) using the Nunjucks (njk) templating engine, you can use the default filter to provide a fallback value if a variable is null, undefined, or an empty string. Here's how you can do it:

<title>{{ title | default(site.title) }}</title>

In this example, if title is not set or is null, it will fall back to using site.title. This can be particularly useful when rendering dynamic content where certain data might be missing or optional.

This approach should help streamline handling default values in your templates.