Interpolation

Pug provides operators for a variety of your different interpolative needs.

String Interpolation, Escaped

Consider the placement of the template locals title, author, and theGreat in the following template.

title follows the basic pattern for evaluating a template local, but the code in between #{ and } is evaluated, escaped, and the result buffered into the output of the template being rendered.

This can be any valid Javascript expression, so you can do whatever feels good.

Pug is smart enough to figure out where the expression ends, so you can even include } without escaping.

If you need to include verbatim #{, you can either escape it or use interpolation (so meta!).

String Interpolation, Unescaped

You don’t have to play it safe. You can buffer unescaped values into your templates, too.

Caution

Keep in mind that buffering unescaped content into your templates can be mighty risky if that content comes fresh from your users. Never trust user input!

Tag Interpolation

Interpolation works not only on JavaScript values, but on Pug as well using the tag interpolation syntax. It is used like so:

You could accomplish the same thing by writing an HTML tag inline with your Pug, but then what’s the point of writing the Pug? Wrap an inline Pug tag declaration in #[ and ] and it’ll be evaluated and buffered into the content of its containing tag.

Whitespace Control

The tag interpolation syntax is especially useful for inline tags, where whitespace before and after the tag is significant. By default, however, Pug removes all spaces before and after tags. Check out the following example: