From d7cf6c9a27487b182c1e6d832a58e01d022b97fa Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Sun, 29 Aug 2021 15:28:05 +0100
Subject: Array index

---
 src/ffi.js | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/ffi.js')

diff --git a/src/ffi.js b/src/ffi.js
index 81362bb..c0b2076 100644
--- a/src/ffi.js
+++ b/src/ffi.js
@@ -1,3 +1,5 @@
+import { Ok, Error } from "./gleam.js";
+
 export function toArray(list) {
   return list.toArray();
 }
@@ -17,3 +19,7 @@ export function reduce(thing, acc, fn) {
 export function reduceRight(thing, acc, fn) {
   return thing.reduceRight(fn, acc);
 }
+
+export function index(thing, index) {
+  return index in thing ? new Ok(thing[index]) : new Error(undefined);
+}
-- 
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