Merge pull request #99 from Lemoncode/bugfix/fix-reduce-async-error

Bugfix/fix reduce async error

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@lemoncode/fonk",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "Form schema validator library",
   "main": "dist/@lemoncode/fonk.cjs.js",
   "module": "dist/@lemoncode/fonk.esm.js",

src/helpers/helpers.spec.ts

@@ -833,6 +833,24 @@ describe('safeObjectKeys', () => {
 });
 
 describe('reduceAsync', () => {
+  it('should return default value when it calls with array equals undefined', async () => {
+    // Arrange
+    const array = undefined;
+
+    const sumAsync = async (a, b): Promise<number> => {
+      return a + b;
+    };
+
+    const callback = jest.fn();
+    const defaultValue = 0;
+
+    // Act
+    const result = await reduceAsync(array, callback, defaultValue);
+
+    // Assert
+    expect(result).toEqual(defaultValue);
+  });
+
   it('should return default value when it calls with array equals empty', async () => {
     // Arrange
     const array = [];

src/helpers/helpers.ts

@@ -33,9 +33,11 @@ export const reduceAsync = <Entity, Result>(
   callback: (acc: Result, entity: Entity, index?: number) => Promise<Result>,
   defaultResult: Result | Promise<Result>
 ): Promise<any> =>
-  collection.reduce<Promise<Result>>((promise, item, index) => {
-    return promise.then((result) => callback(result, item, index));
-  }, Promise.resolve(defaultResult));
+  Array.isArray(collection)
+    ? collection.reduce<Promise<Result>>((promise, item, index) => {
+        return promise.then((result) => callback(result, item, index));
+      }, Promise.resolve(defaultResult))
+    : Promise.resolve(defaultResult);
 
 export const isFieldIdInSchema = (
   fieldId: string,