Photon Interactive Interview Questions and Answers

Promises are objects in JavaScript that represent the eventual completion or failure of an asynchronous operation.

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

• You create a Promise using the 'new Promise' constructor.

• Example: const myPromise = new Promise((resolve, reject) => { /* async code */ });

• You handle the result of a Promise using '.then()' for success and '.catch()' for errors...read more

The Event Loop is a programming construct that manages asynchronous operations in JavaScript, enabling non-blocking execution.

• The Event Loop allows JavaScript to perform non-blocking I/O operations despite being single-threaded.

• It works by continuously checking the call stack and the message queue.

• When the call stack is empty, the Event Loop pushes the first message from the queue to the stack for execution.

• Exampl...read more

Async and Await are keywords in programming that simplify asynchronous code, making it easier to read and maintain.

• Async functions return a promise, allowing for non-blocking operations.

• Await pauses the execution of an async function until the promise is resolved.

• Example: async function fetchData() { const data = await fetch(url); }

• Using async/await improves code readability compared to traditional promise chainin...read more

Key Performance Indicators (KPIs) in Scrum help measure team performance and project progress effectively.

• Velocity: Measures the amount of work completed in a sprint, e.g., story points completed.

• Sprint Burndown: Tracks remaining work in a sprint, visualizing progress over time.

• Lead Time: Time taken from the start of work to completion, indicating efficiency.

• Cycle Time: Measures the time taken to complete a task o...read more

Scrum Masters facilitate Agile processes, while Project Managers oversee project execution and resource management.

• Scrum Masters focus on team dynamics and Agile practices, ensuring the team follows Scrum principles.

• Project Managers handle project scope, timelines, and budgets, often using traditional methodologies like Waterfall.

• Example: A Scrum Master may organize daily stand-ups, while a Project Manager creates...read more

Implementing effective recruitment strategies enhances talent acquisition and aligns candidates with organizational goals.

• Utilize social media platforms for job postings and employer branding, e.g., LinkedIn, Facebook.

• Implement an employee referral program to leverage existing employees' networks.

• Conduct targeted outreach to universities and colleges for internships and entry-level positions.

• Use data analytics to ...read more

Task involved manipulating strings in JavaScript, focusing on common operations and methods.

• Use .length to find the length of a string. Example: 'Hello'.length returns 5.

• Use .toUpperCase() to convert a string to uppercase. Example: 'hello'.toUpperCase() returns 'HELLO'.

• Use .split() to divide a string into an array. Example: 'a,b,c'.split(',') returns ['a', 'b', 'c'].

• Use .replace() to replace parts of a string. Exa...read more

Map and filter are higher-order functions in JavaScript used to manipulate arrays.

• Map: Transforms each element in an array and returns a new array with the transformed elements.

• Example: [1, 2, 3].map(num => num * 2) => [2, 4, 6]

• Filter: Creates a new array with elements that pass a certain condition.

• Example: [1, 2, 3, 4].filter(num => num % 2 === 0) => [2, 4]