sema-docs 1.20.2

Canonical structured documentation for Sema builtins/special forms; powers LSP hover/completion and REPL apropos
Documentation 
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---
name: "first"
module: "vectors"
section: "Indexed Access"
---

Return the first element of a vector (or list). Returns `nil` for empty vectors.

```sema
(first [1 2 3])   ; => 1
(first [])        ; => nil
```