(arg)

argument and parameter positions

(arg pos? val?)

Where:

1. pos: position in the list (1-based) *
2. val: value at that position *

Examples

Find zero-delay timers that can starve the main thread.

(call setTimeout (arg 2 (num 0)))

Selects in lines { 1 } but not in { 2, 3 }:

setTimeout(tick, 0)
setTimeout(tick, 250)
setInterval(tick, 0)

---

Identify request handlers when migrating server frameworks.

(fun _ (:and (arg 1 (id req)) (arg 2 (id res))))

Selects in lines { 1, 2 } but not in { 3 }:

function handle(req, res) {}
const handleArrow = (req, res) => {}
function reversed(res, req) {}

---

Find one-time event listeners that are safe to remove manually.

(call (mem addEventListener) (arg 3 (obj (prop once))))

Selects in lines { 1 } but not in { 2, 3 }:

button.addEventListener("click", onClick, { once: true })
window.addEventListener("scroll", onScroll, { passive: true })
document.addEventListener("keydown", onKey)

---

Arguments

pos

• Number

Does NOT support: Composition — Free-form Selection — Refinement — Replacement

val

• Identifier: shorthand for (id)
• String: shorthand for (str)
• (:kind) • (:ref) • (:text) • (arr) • (attr) • (bool) • (call) • (child) • (comp) • (export) • (fun) • (id) • (id+) • (import) • (jsx) • (mem) • (null) • (num) • (obj) • (of) • (prop) • (regex) • (regex+) • (str) • (str*) • (str+) • (tpl) • (tpl*) • (var) • (:into) • (:and) • (:or) • (:not) • (:replace) • (:capture)