Coforge Angular Developer Interview Questions and Answers

Angular life cycle hooks are methods that allow you to tap into specific points in a component's life cycle.

• ngOnChanges: called when an input property changes

• ngOnInit: called once the component is initialized

• ngOnDestroy: called before the component is destroyed

• ngAfterViewInit: called after the component's view has been fully initialized

The digest cycle in Angular is the process where Angular checks all the watchers in the scope for changes and updates the view accordingly.

• During the digest cycle, Angular compares the current value of the watchers with the previous value to detect changes.

• If a change is detected, Angular updates the view to reflect the changes.

• The digest cycle continues until all watchers have been checked and no more changes are dete...read more

Number vs parseInt: Number converts a string to a number, parseInt parses a string and returns an integer. Find vs Filter: Find returns the first element that matches a condition, Filter returns all elements that match a condition.

• Number vs parseInt: Number('10') returns 10, parseInt('10.5') returns 10

• Find vs Filter: [1, 2, 3, 4, 5].find(num => num > 3) returns 4, [1, 2, 3, 4, 5].filter(num => num > 3) returns [4, 5]

Promises are objects representing the eventual completion or failure of an asynchronous operation. Types refer to the data types in TypeScript.

• Promises are used for handling asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Types in TypeScript help catch errors early by enforcing data types at compile time.

• Examples: Promise.resolve(), Promise.reject(), string, num