Angular 5 vs. Angular 4

Angular 5 vs. Angular 4 [What are difference between Angular 5 and 4?]

Angular 5 is going to be a much better Angular and you will be able to take advantage of it much easier and Version 5 will be fully released on September/October 2017.

Angular 2 vs. Angular 1 Angular 4 vs. Angular 2 Angular 5 vs. Angular 4 Angular 6 vs Angular 5

The Angular 5 Contains bunch of new features, performance improvements and lot of bug fixes and also some surprises to Angular lovers.
·       Make AOT the default
·       Watch mode
·       Type checking in templates
·       More flexible metadata
·       Remove *.ngfactory.ts files
·       Better error messages
·       Smooth upgrades
·       Tree-Shakeable components
·       Hybrid Upgrade Application
·       And so on...

Angular 5 Performance Improvements - Angular 5
·       Use of addEventListener for the faster rendering and it is the core functionality.
·       Update to new version of build-optimizer.
·       Added some Improvements on the abstract class methods and interfaces
·       Remove decorator DSL which depends on Reflect for Improve the Performance of Apps and This is the core functionality.
·       Added an option to remove blank text nodes from compiled templates
·       Switch Angular to use Static-Injector instead of Reflective-Injector.
·       Improve the applications testing.
·       Improve the performance of hybrid applications
·       Improvements on Lazy loading for Angular
·       And so on...

Some Improvement on HttpClient – This is used for Applications communicate with backend services over the HTTP protocol!
·       Improvement on Type-checking the response
·       Improvement on Reading the full response
·       Improvement on Error handling and fetching error details
·       Improvement on Intercepting all requests or responses
·       Improvement on Logging
·       Improvement on Caching
·       Improvement on XSRF Protection

Added Features - Angular 5
·       Added Representation of Placeholders to xliff and xmb in the compiler
·       Added an Options Arg to Abstract Controls in the forms controls
·       Added add default updateOn values for groups and arrays to form controls
·       Added updateOn blur option to form controls
·       Added updateOn submit option to form controls
·       Added an Events Tracking Activation of Individual Routes
·       Added NgTemplateOutlet API as stable in the common controls
·       Create StaticInjector which does not depend on Reflect polyfill
·       Added [@.disabled] attribute to disable animation children in the animations
·       And so on..

Router Life Cycle Events – Angular 5
Added new router life cycle events for Guards and Resolvers -
·       GuardsCheckStart,
·       GuardsCheckEnd,
·       ResolveStart and
·       ResolveEnd

Angular 5 Bug Fixes - Angular 5
·       Fixed compilation error by using the correct type for providers
·       Skip PWA test when redeploying non-public commit
·       Don't strip CSS source maps. This is the compiler related fix
·       Remove tsickle (language-service) dependency
·       Support persisting dynamic styles within animation states
·       Ignore @import in multi-line css
·       Fix platform-browser-dynamic
·       Forbid destroyed views to be inserted or moved in VC
·       Support persisting dynamic styles within animation states
·       And so on...

 Angular 4 contains some additional Enhancement and Improvement. Consider the following enhancements.
1.    Smaller & Faster Apps
2.    View Engine Size Reduce
3.    Animation Package
4.    NgIf and ngFor Improvement
5.    Template
6.    NgIf with Else
7.    Use of AS keyword
8.    Pipes
9.    HTTP Request Simplified
10. Apps Testing Simplified
11. Introduce Meta Tags
12. Added some Forms Validators Attributes
13. Added Compare Select Options
14. Enhancement in Router
15. Added Optional Parameter
16. Improvement Internationalization

1. Smaller & Faster Apps - Angular 4 applications is smaller & faster in comparison with Angular 2.

2. View Engine Size Reduce - Some changes under to hood to what AOT generated code compilation that means in Angular 4, improved the compilation time. These changes reduce around 60% size in most cases.

3. Animation Package- Animations now have their own package i.e. @angular/platform-browser/animations

4. Improvement - Some Improvement on *ngIf and *ngFor.

Stayed Informed  Angular 2 vs. Angular 1

5. Template - The template is now ng-template. You should use the “ng-template” tag instead of “template”. Now Angular has its own template tag that is called “ng-template”.

6. NgIf with Else – Now in Angular 4, possible to use an else syntax as,

<div *ngIf="user.length > 0; else empty"><h2>Users</h2></div>
<ng-template #empty><h2>No users.</h2></ng-template>

7. AS keyword – A new addition to the template syntax is the “as keyword” is use to simplify to the “let” syntax.

Use of as keyword,
<div *ngFor="let user of users | slice:0:2 as total; index as = i">
    {{i+1}}/{{total.length}}: {{}}

To subscribe only once to a pipe “|” with “async” and If a user is an observable, you can now use to write,
<div *ngIf="users | async as usersModel">
    <h2>{{ }}</h2> <small>{{ usersModel.age }}</small>

8. Pipes - Angular 4 introduced a new “titlecase” pipe “|” and use to changes the first letter of each word into the uppercase. 

The example as,
<h2>{{ 'anil singh' | titlecase }}</h2>
<!-- OUPPUT - It will display 'Anil Singh' -->

9. Http - Adding search parameters to an “HTTP request” has been simplified as,
//Angular 4 -
http.get(`${baseUrl}/api/users`, { params: { sort: 'ascending' } });

//Angular 2-
const params = new URLSearchParams();
params.append('sort', 'ascending');
http.get(`${baseUrl}/api/users`, { search: params });

10. Test- Angular 4, overriding a template in a test has also been simplified as,
//Angular 4 -
TestBed.overrideTemplate(UsersComponent, '<h2>{{}}</h2>');

//Angular 2 -
TestBed.overrideComponent(UsersComponent, {
    set: { template: '<h2>{{}}</h2>' }

11. Service- A new service has been introduced to easily get or update “Meta Tags” i.e.
    selector: 'users-app',
    template: `<h1>Users</h1>`
export class UsersAppComponent {
    constructor(meta: Meta) {
        meta.addTag({ name: 'Blogger', content: 'Anil Singh' });

12. Forms Validators - One new validator joins the existing “required”, “minLength”, “maxLength” and “pattern”. An email helps you validate that the input is a valid email.

13. Compare Select Options - A new “compareWith” directive has been added and it used to help you compare options from a select.
<select [compareWith]="byUId" [(ngModel)]="selectedUsers">
    <option *ngFor="let user of users" [ngValue]="user.UId">{{}}</option>

14. Router - A new interface “paramMap” and “queryParamMap” has been added and it introduced to represent the parameters of a URL. 

const uid = this.route.snapshot.paramMap.get('UId');
this.userService.get(uid).subscribe(user => = name);

15. CanDeactivate - This “CanDeactivate” interface now has an extra (optional) parameter and it is containing the next state.

16. I18n - The internationalization is tiny improvement.
//Angular 4-
<div [ngPlural]="value">
    <ng-template ngPluralCase="0">there is nothing</ng-template>
    <ng-template ngPluralCase="1">there is one</ng-template>

//Angular 2-
<div [ngPlural]="value">
    <ng-template ngPluralCase="=0">there is nothing</ng-template>
    <ng-template ngPluralCase="=1">there is one</ng-template>

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