Refactor createForm() to provide composible factory methods

libs/contact/src/lib/services/contact-form.service.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
 import { FormArray, FormBuilder, FormGroup } from '@angular/forms';
-import { Contact } from '@nested-forms/contact';
+import { Contact, Name, Address } from '@nested-forms/contact';
 
 @Injectable({
   providedIn: 'root',
@@ -9,35 +9,41 @@ export class ContactFormService {
   constructor(private fb: FormBuilder) {}
 
   public createForm(model: Contact): FormGroup {
-    const name = model.name;
+    return this.fb.group({
+      name: this.createContactNameForm(model.name),
+      addresses: this.createContactAddressListForm(model.addresses),
+    });
+  }
 
-    const addresses: FormArray = this.fb.array([]);
-
-    const group = this.fb.group({
-      name: this.fb.group({
+  public createContactNameForm(name: Name): FormGroup {
+    return this.fb.group({
       firstName: [name ? name.firstName : ''],
       lastName: [name ? name.lastName : ''],
       middleName: [name ? name.middleName : ''],
       prefix: [name ? name.prefix : ''],
       suffix: [name ? name.suffix : ''],
-      }),
-      addresses: addresses,
-    });
+    })
+  }
 
-    if (model.addresses) {
-      model.addresses.forEach(addr => {
-        addresses.push(
-          this.fb.group({
+  public createContactAddressListForm(addresses: Address[]): FormArray {
+    const list: FormArray = this.fb.array([]);
+
+    if (addresses) {
+      addresses.forEach(addr => {
+        list.push(this.createContactAddressForm(addr));
+      });
+    }
+
+    return list;
+  }
+
+  public createContactAddressForm(addr: Address): FormGroup {
+    return this.fb.group({
       line1: [addr ? addr.line1 : ''],
       line2: [addr ? addr.line2 : ''],
       city: [addr ? addr.city : ''],
       state: [addr ? addr.state : ''],
       postalCode: [addr ? addr.postalCode : ''],
-          }),
-        );
     });
   }
-
-    return group;
-  }
 }