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// Test closures.
// Ref: false
---
// Don't parse closure directly in content.
// Ref: true
#let x = "x"
// Should output `x => y`.
#x => y
---
// Basic closure without captures.
{
let adder = (x, y) => x + y
test(adder(2, 3), 5)
}
---
// Pass closure as argument and return closure.
// Also uses shorthand syntax for a single argument.
{
let chain = (f, g) => (x) => f(g(x))
let f = x => x + 1
let g = x => 2 * x
let h = chain(f, g)
test(h(2), 5)
}
---
// Capture environment.
{
let mark = "?"
let greet = {
let hi = "Hi"
name => {
hi + ", " + name + mark
}
}
test(greet("Typst"), "Hi, Typst?")
mark = "!"
test(greet("Typst"), "Hi, Typst!")
}
---
// Redefined variable.
{
let x = 1
let f() = {
let x = x + 2
x
}
test(f(), 3)
}
---
// Import bindings.
{
let b = "target.typ"
let f() = {
import b from b
b
}
test(f(), 1)
}
---
// For loop bindings.
{
let v = (1, 2, 3)
let s = 0
let f() = {
for v in v { s += v }
}
f()
test(s, 6)
}
---
// Let + closure bindings.
{
let g = "hi"
let f() = {
let g() = "bye"
g()
}
test(f(), "bye")
}
---
// Parameter bindings.
{
let x = 5
let g() = {
let f(x, y: x) = x + y
f
}
test(g()(8), 13)
}
---
// Don't leak environment.
{
// Error: 16-17 unknown variable
let func() = x
let x = "hi"
func()
}
---
// Too few arguments.
{
let types(x, y) = "[" + type(x) + ", " + type(y) + "]"
test(types(14%, 12pt), "[ratio, length]")
// Error: 13-21 missing argument: y
test(types("nope"), "[string, none]")
}
---
// Too many arguments.
{
let f(x) = x + 1
// Error: 8-13 unexpected argument
f(1, "two", () => x)
}
---
// Named arguments.
{
let greet(name, birthday: false) = {
if birthday { "Happy Birthday, " } else { "Hey, " } + name + "!"
}
test(greet("Typst"), "Hey, Typst!")
test(greet("Typst", birthday: true), "Happy Birthday, Typst!")
// Error: 23-35 unexpected argument
test(greet("Typst", whatever: 10))
}
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