feat(ch07): add named arguments examples

src/ch-07_fp-intro-to-js/7.1_fp-intro-to-js.js

@@ -5,3 +5,8 @@ export const myReducer = (state = {}, action = {}) => {
         ? Object.assign({}, state, payload)
         : state
 };
+
+export const newUser = ({name = 'NoName', lastName = 'NoLastName'}) => ({
+    name,
+    lastName,
+});

src/ch-07_fp-intro-to-js/7.1_fp-intro-to-js.test.js

@@ -1,5 +1,5 @@
 import {expect} from 'chai';
-import {myReducer} from "./7.1_fp-intro-to-js";
+import {myReducer, newUser} from "./7.1_fp-intro-to-js";
 
 describe("Functional Programmer's intro to JS", () => {
     it("should show how to destructure an array", () => {
@@ -45,4 +45,25 @@ describe("Functional Programmer's intro to JS", () => {
 
         expect(bar).to.equal('foo');
     });
+
+    it("should mimic named arguments using destructuring", () => {
+        const marcoPolo = newUser({
+            name: 'Marco',
+            lastName: 'Polo'
+        });
+
+        expect(marcoPolo).to.deep.equal({
+            name: 'Marco',
+            lastName: 'Polo'
+        })
+    });
+
+    it("should mimic named arguments using destructuring and default parameters", () => {
+        const anonymous = newUser({});
+
+        expect(anonymous).to.deep.equal({
+            name: 'NoName',
+            lastName: 'NoLastName'
+        })
+    });
 });