Wicode Infotech Interview Questions and Answers

Yes, I presented a POC for a new feature in our company's software platform.

• I conducted research to identify the need for the new feature

• I developed a prototype to demonstrate the functionality of the feature

• I presented the POC to stakeholders for feedback and approval

Find the longest substring without repeating characters in a given string.

• Use a sliding window approach to iterate through the string and keep track of the characters seen so far.

• Update the start index of the window when a repeating character is encountered.

• Keep track of the longest substring length and characters seen in a hashmap.

Callbacks run first before promises in JavaScript.

• Callbacks are executed immediately when they are defined.

• Promises are executed asynchronously, after the current call stack is empty.

• Example: Callback function passed to setTimeout() runs before the promise resolves.

Singleton in Angular can be achieved by creating a service with providedIn: 'root' in the @Injectable decorator.

• Create a service with providedIn: 'root' in the @Injectable decorator

• Use the service throughout the application to ensure only one instance is created

RXJS subject is a generic observable while behavior subject has an initial value and replays it to new subscribers.

• RXJS subject is a generic observable that can emit multiple values to multiple subscribers.

• Behavior subject is a type of subject that requires an initial value and replays it to new subscribers.

• Behavior subject is useful for scenarios where you always want new subscribers to get the most recent value.

• Example: RXJS subject - new Subject(), Behavior subject - new B...read more

Event Loop in JS manages asynchronous operations by executing callback functions in a queue.

• Event Loop is a mechanism in JavaScript that allows asynchronous operations to be handled efficiently.

• It continuously checks the call stack for any functions to execute, and the callback queue for any functions to be pushed onto the call stack.

• Example: setTimeout() function in JS uses the Event Loop to execute a callback function after a specified delay.