Update forEach function in Chunk to include missing index paramet… (#4404)

Author: gcanti

.changeset/nine-waves-protect.md

@@ -0,0 +1,5 @@
+---
+"effect": patch
+---
+
+Update `forEach` function in `Chunk` to include missing index parameter.

packages/effect/src/Chunk.ts

@@ -738,14 +738,21 @@ export const flatMap: {
 })
 
 /**
- * Applies the specified function to each element of the `List`.
+ * Iterates over each element of a `Chunk` and applies a function to it.
+ *
+ * **Details**
+ *
+ * This function processes every element of the given `Chunk`, calling the
+ * provided function `f` on each element. It does not return a new value;
+ * instead, it is primarily used for side effects, such as logging or
+ * accumulating data in an external variable.
  *
  * @since 2.0.0
  * @category combinators
  */
 export const forEach: {
-  <A, B>(f: (a: A) => B): (self: Chunk<A>) => void
-  <A, B>(self: Chunk<A>, f: (a: A) => B): void
+  <A, B>(f: (a: A, index: number) => B): (self: Chunk<A>) => void
+  <A, B>(self: Chunk<A>, f: (a: A, index: number) => B): void
 } = dual(2, <A, B>(self: Chunk<A>, f: (a: A) => B): void => toReadonlyArray(self).forEach(f))
 
 /**

packages/effect/test/Chunk.test.ts

@@ -840,9 +840,9 @@ describe("Chunk", () => {
   })
 
   it("forEach", () => {
-    const as: Array<number> = []
-    Chunk.forEach(Chunk.make(1, 2, 3, 4), (n) => as.push(n))
-    deepStrictEqual(as, [1, 2, 3, 4])
+    const as: Array<string> = []
+    Chunk.forEach(Chunk.make(1, 2, 3, 4), (n, i) => as.push(`${n}-${i}`))
+    deepStrictEqual(as, ["1-0", "2-1", "3-2", "4-3"])
   })
 
   it("sortWith", () => {