feat: implement from array

package.json

@@ -18,6 +18,8 @@
   "license": "ISC",
   "devDependencies": {
     "@biomejs/biome": "^1.3.3",
+    "@edge-runtime/vm": "^3.1.7",
+    "happy-dom": "^12.10.3",
     "vitest": "^0.34.6"
   }
 }

src/fromArray.ts

@@ -0,0 +1,11 @@
+export const fromArray = <T>(array: T[]): ReadableStream<T> => {
+    const arrayLength = array.length
+    return new ReadableStream<T>({
+        start(controller) {
+            for (let i = 0; i < arrayLength; i++) {
+                controller.enqueue(array[i])
+            }
+            controller.close()
+        }
+    })
+}

test/fromArray.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest'
+import { fromArray } from '../src/fromArray'
+
+describe('fromArray', () => {
+    it('should create a readable stream from an array', async () => {
+        const array = [1, 2, 3]
+
+        const reader = fromArray(array).getReader()
+
+        for (let i = 0; i < array.length; i++) {
+            const result = await reader.read()
+            expect(result.value).toEqual(array[i])
+            expect(result.done).toEqual(false)
+        }
+
+        expect(await reader.read()).toEqual({ done: true, value: undefined })
+    })
+})