Array fold

2 files changed, 7 insertions, 0 deletions

diff --git a/src/ffi.js b/src/ffi.js
index 06303fc..91a2f73 100644
--- a/src/ffi.js
+++ b/src/ffi.js
@@ -9,3 +9,7 @@ export function map(thing, fn) {
 export function length(thing) {
   return thing.length;
 }
+
+export function reduce(thing, acc, fn) {
+  return thing.reduce(fn, acc);
+}
diff --git a/src/gleam/javascript/array.gleam b/src/gleam/javascript/array.gleam
index 6c4819e..20d12d1 100644
--- a/src/gleam/javascript/array.gleam
+++ b/src/gleam/javascript/array.gleam
@@ -11,3 +11,6 @@ pub external fn length(Array(element)) -> Int =
 
 pub external fn map(Array(a), fn(a) -> b) -> Array(b) =
   "../../ffi.js" "map"
+
+pub external fn fold(Array(e), a, fn(a, e) -> a) -> a =
+  "../../ffi.js" "reduce"