(el)

array elements selected by position and/or value (used with (arr ...))

(el pos? val?)

Where:

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

Behavior

• With only a position, (el N) matches arrays that have an element at that position.
• Without position or value, (el) only matches non-empty arrays.

Examples

Extract route handlers from [method, path, handler] tuples.

(arr (el 3 (:into)))

Selects in lines { 2, 3 } but not in { 4 }:

const routes = [
  ["GET", "/health", health],
  ["POST", "/users", createUser],
  ["GET", "/status"]
]

---

Find arrays that use null as a sentinel in the first slot.

(arr (el 1 (null)))

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

const rows1 = [null, "ready"]
const rows2 = ["ready", null]
const rows3 = [null, "done"]

---

Locate arrays that include the beta flag anywhere in the list.

(arr (el _ (str "beta")))

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

const flags1 = ["beta", "dark-mode"]
const flags2 = ["stable", "dark-mode"]
const flags3 = ["dark-mode", "beta"]

---

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)