variables

// Content with markup inside
#let blind-text = [_Lorem ipsum_ dolor sit amet]

// Unformatted strings
#let funny-font = "MS Comic Sans"

// Absolute lengths (see also pt, in, ...)
#let mile = 160934cm

// Lengths relative to the font size
#let double-space = 2em

// Ratios
#let progress = 80%

// Integer numbers
#let answer = 42

// Booleans
#let truth = false

// Horizontal and vertical alignment
#let focus = center

// Functions
#let amazed(term, color: blue) = {
  text(color, box[✨ #term ✨])
}

You are #amazed[beautiful]!
I am #amazed(color: purple)[amazed]!

templates

Templates work by wrapping our whole document in a custom function like amazed. But wrapping a whole document in a giant function call would be cumbersome! Instead, we can use an "everything" show rule to achieve the same with cleaner code. To write such a show rule, put a colon directly after the show keyword and then provide a function.

#show: amazed
I choose to focus on the good
in my life and let go of any
negative thoughts or beliefs.
In fact, I am amazing!

You can of course nest other set and show rules within your function:

#let template(doc) = [
  #set text(font: "Inria Serif")
  #show "something cool": [Typst]
  #doc
]

#show: template
I am learning something cool today.
It's going great so far!

with named arguments

#show: doc => conf(
  title: [
    A Fluid Dynamic Model for
    Glacier Flow
  ],
  authors: (
    (
      name: "Theresa Tungsten",
      affiliation: "Artos Institute",
      email: "tung@artos.edu",
    ),
    (
      name: "Eugene Deklan",
      affiliation: "Honduras State",
      email: "e.deklan@hstate.hn",
    ),
  ),
  abstract: lorem(80),
  doc,
)