How to find model number of HP laptop ?

Press Fn key + Esc key

After 1 second, a dialog box will appear with HP system information.

How to get IP address from a given domain name ?

nslookup <domain_name>

EXAMPLE
nslookup hello.geol.sod.in

JavaScript vs. TypeScript

JavaScript

• Browser understands JS
• Problem in JS : Not strict

Typescript

• Superset of JS
• from Microsoft
• provides Type safety over JS code using NameSpace
• Strictly typed
• Browser doesn't support TS
• Typescript code is converted into JS using compiler

What are different features in Angular versions 1x, 2x and 5x

AngularJS

• MVW = Model+View+Whatever ; MVC based architecture

Angular 2x , 4x

• Modern and Fast
• Highy scalable
• Complete Re-write of v1
• Web components based architecture
• Written in TS
• Hierarchical dependency injection
• Reduced bundle size
• Animation module is moved out to a separate
• Support if/else
• Support email validator

Angular 5x

• Easy to build Progressive web apps - PWA (Mobile app feel)
• Updated HttpClient
• Internationalized number/date/currency pipes
• Type checking
• Better error msg
• New router lifecycle events