What is directive and what are the different types of directive? What is Angular life cycle hook? Difference between ngOnChanges(), ngOnInit() and ngDoCheck()? What is closure? What is Hoisting? what is Lazy loading? How to communicate between two component (if parent-child relation or without relation)? What are the different features of ES6? What is RxJS? difference between spread and Reset operator?

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Accepted Answer

Directives in Angular are markers on a DOM element that tell Angular to attach a specific behavior to that element or transform the DOM element and its children.

Types of directives: Structural directives (ngIf, ngFor) and Attribute directives (ngModel, ngStyle)
Angular life cycle hook: A set of methods that Angular calls on a directive/component at defined points in time
Difference between ngOnChanges(), ngOnInit() and ngDoCheck(): ngOnChanges() is called when an input binding value changes, ngOnInit() is called once after the first ngOnChanges(), ngDoCheck() is called during every change detection run
Closure: A function that has access to its own scope, the outer function's scope, and the global scope
Hoisting: JavaScript behavior where variable and function declarations are moved to the top of their containing scope
Lazy loading: Loading modules only when they are needed, improving performance by reducing initial load time
Communication between components: Using @Input() and @Output() for parent-child communication, and services or observables for unrelated components
Features of ES6: Arrow functions, let and const, classes, template literals, destructuring, spread/rest operators, promises, modules
RxJS: Library for reactive programming using Observables
Difference between spread and reset operator: Spread operator (...) is used to split up array elements or object properties, while the reset operator (...) is used to merge elements or properties into an array or object

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