fix: work on filters

src/builtin-filters.js

@@ -85,7 +85,7 @@ export function sort(array) {
  * @param {Iterable} array
  * @param {number} amount
  */
-export function last(amount = 1) {
+export function last(array, amount = 1) {
   return Array.from(array).reverse().slice(0, amount);
 }
 

tests/builtin-filters.test.js

@@ -1,13 +1,34 @@
 import { describe, test } from 'node:test'
 import assert from 'node:assert/strict'
 
-import { json } from '../src/builtin-filters.js'
+import { json, limit, last, async, each } from '../src/builtin-filters.js'
 
 describe('built-in filters', () => {
   test('json', () => {
     assert.equal(json({name: 'Lea'}), '{"name":"Lea"}');
   });
 
-
+  test('limit', () => {
+    const array = [1, 2, 3, 4, 5];
+    assert.deepEqual(limit(array, 3), [1,2,3]);
+  });
+
+  test('last', () => {
+    const array = [1, 2, 3, 4, 5];
+    assert.deepEqual(last(array), [5]);
+  });
 
+  test('each', () => {
+    const array = [1, 2, 3];
+    const li = (item) => `<li>${item}</li>`
+    assert.deepEqual(each(array, li), 
+      '<li>1</li><li>2</li><li>3</li>'
+    );
+  });
+
+  test('async', async () => {
+    const promised = Promise.resolve(42);
+    assert.equal(await async(promised), 42);
+  });
+
 });