Cognizant Application Developer Interview Questions, Process, and Tips

Promises and observables are both used for handling asynchronous operations in JavaScript.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation and allow you to handle the result using then() and catch() methods.

• Observables are a more powerful way of handling asynchronous operations that allow you to subscribe to a stream of data and react to each event as it occurs.

• Observa...read more

Lifecycle hooks are functions that allow you to tap into specific moments in the Angular lifecycle.

• There are eight lifecycle hooks in Angular: ngOnChanges, ngOnInit, ngDoCheck, ngAfterContentInit, ngAfterContentChecked, ngAfterViewInit, ngAfterViewChecked, ngOnDestroy

• ngOnChanges is called when an input property changes

• ngOnInit is called once the component is initialized

• ngDoCheck is called during every change detection ...read more

Inheritance in JavaScript allows objects to inherit properties and methods from other objects.

• Inheritance is achieved through the use of prototypes

• Child objects can access properties and methods of parent objects

• Object.create() and class syntax can be used to create inheritance

• Example: Child.prototype = Object.create(Parent.prototype)

• Example: class Child extends Parent {}