AOT in angular Idempotent in rest API Lazy loading in angular

Coding Test: ** Using normal loops not to use any collections classes Array-1 [2,3,7] Array-2 [4,5,8] Final Output as below: [2,3,4,5,7,8]

Code review best practices Slowness in your application, what's your approach Security in your current application, Explain end to end Solid principal Design pattern (Factory Pattern, Abstract Factory, Factory Method pattern?) Dependency Injections Performance improvement of web application startup Major challenge in Current project