sema-docs 1.20.4

Canonical structured documentation for Sema builtins/special forms; powers LSP hover/completion and REPL apropos
Documentation 
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---
name: "length"
module: "lists"
section: "Basic Operations"
---

Return the number of elements in a list.

```sema
(length '(1 2 3))  ; => 3
(length '())       ; => 0
```