LOYALTY METHODS Senior Frontend Web Developer Interview Questions and Answers

Q1. What are AOT and JIT in Angular?
Ans. 
AOT and JIT are compilation techniques in Angular.
• AOT (Ahead-of-Time) compilation is done at build time, converting TypeScript and HTML code into efficient JavaScript code before the browser runs it.

• JIT (Just-in-Time) compilation is done at runtime, converting TypeScript and HTML code into JavaScript code while the application is running.

• AOT improves performance by reducing the size of the bundle and optimizing the cod...read more
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Q2. Observables vs promises
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Observables are streams of data that can be subscribed to, while promises are a single future value.
• Observables can handle multiple values over time, while promises can only handle a single value.

• Observables are cancellable, while promises are not.

• Observables support operators like map, filter, and reduce for data transformation.

• Promises have a simpler API with just then and catch methods.

• Observables are lazy, meaning ...read more
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Q3. What is data binding and types?
Ans. 
Data binding is the automatic synchronization of data between the model and view components in an application.
• Data binding allows for the seamless updating of data in the model and reflecting those changes in the view without manual intervention.

• There are two types of data binding in Angular: one-way binding and two-way binding.

• One-way binding updates the view when the model changes, while two-way binding updates both ...read more
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Q4. What is closure?
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Closure is a function that has access to its own scope, as well as the scope of its outer function.
• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in JavaScript to create private variables and functions.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(oute
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Q5. Lazyloading in angular
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Lazy loading in Angular is a technique used to load modules only when they are needed, improving performance.
• Lazy loading helps reduce initial load time by loading modules on demand

• Implemented using loadChildren property in routes configuration

• Lazy loaded modules have their own routes and components
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Q6. Directives in Angular and Types
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Directives in Angular are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform the DOM element and its children.
• Directives are used to create reusable components in Angular.

• There are three types of directives in Angular: Component, Structural, and Attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.
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Pagination task and filter table data

Q1. Interviewer was not letting complete my response
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Q2. If i was giving correct response, then he was interrupting and changing the question.
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Q1. React QA and javascript QA
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Even after answering all the questions correctly along with coding done with exact expected output you will get rejected becoz they are fake job interview or eye wash campaign it’s better to avoid.

Q1. What is the difference between debounce and throttling
Ans. 
Debounce delays the execution of a function until after a specified time period, while throttling limits the rate at which a function can be executed.
• Debounce waits for a specified time period of inactivity before executing the function, while throttling limits the rate at which the function can be called.

• Debounce is useful for scenarios like search bars where you want to wait for the user to finish typing before makin...read more
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Q2. What was used before Rest APIs
Ans. 
SOAP (Simple Object Access Protocol) was used before Rest APIs for web services communication.
• SOAP was a protocol for exchanging structured information in the implementation of web services.

• SOAP used XML for message format and relied heavily on HTTP for communication.

• SOAP was more rigid and complex compared to Rest APIs, which are more lightweight and flexible.

• Examples of SOAP-based web services include Microsoft's .NE
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Q1. Angular advanced concepts?
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Q2. Javascript coding round ?
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Q1. 1. Html related tags questions, new tags in htmls, what is inline block, sigular tag 2. css related question: what is selector, how to apply css for global, flex 3. javascript questions, need to give outpu...read more
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Q1. 2nd round was also the technical. those who are selected in both round was going to get result in next working day.
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Q1. Types of Promises
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and .catch() to handle errors.

• Promises can be created using the Promise constructor or by using async/await syntax.
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Q2. Difference between useState and useEffect
Ans. 
useState is used to manage state in functional components, while useEffect is used to perform side effects in functional components.
• useState is used to declare state variables in functional components.

• useEffect is used to perform side effects in functional components, such as data fetching, subscriptions, or manually changing the DOM.

• useState does not trigger re-renders, while useEffect can be used to trigger re-render...read more
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Q3. What is Callback hell
Ans. 
Callback hell is a situation where multiple nested callbacks make the code difficult to read and maintain.
• Occurs when multiple asynchronous operations are nested within each other

• Leads to deeply nested code structure which is hard to understand

• Can be avoided by using Promises, async/await, or modularizing code
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Q4. Difference between traditional function and arrow function
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Traditional functions are defined using the function keyword, while arrow functions are defined using a concise syntax with =>.
• Traditional functions are hoisted, while arrow functions are not.

• Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

• Arrow functions are more concise and easier to read compared to traditional functions.

• Traditional functions are better for methods in obje...read more
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Q5. Usecase to create counter in react
Ans. 
Creating a counter in React to increment and decrement a value.
• Create a state variable to store the count value

• Use setState to update the count value

• Render the count value in the component

• Add buttons to increment and decrement the count value
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Q6. Program to find frequency of letters in a string
Ans. 
Program to find frequency of letters in a string
• Create an object to store the frequency of each letter

• Loop through the string and increment the count of each letter in the object

• Convert the object into an array of strings with letter and frequency pairs
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Q7. Program to find if substring is present in a given string without using predefined functions
Ans. 
Iterate through the given string to check if the substring is present.
• Iterate through the given string and check if each character matches the first character of the substring.

• If a match is found, check the subsequent characters to see if they form the substring.

• Return true if the entire substring is found within the given string, otherwise return false.
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Q1. Lots of questions about ANGULAR, HTML, CSS & Js. Seems like rapid fire round.
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Q2. Typescript based questions.
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Q3. Angular lifecycle
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Q4. Difference between SVG & CANVAS
Ans. 
SVG is a vector-based graphics format while Canvas is a bitmap-based graphics format.
• SVG uses XML to define graphics and is resolution-independent.

• SVG elements can be styled with CSS and manipulated with JavaScript.

• Canvas is a pixel-based grid where graphics are drawn programmatically.

• Canvas is more suitable for complex animations and real-time rendering.

• Canvas has better performance for rendering large amounts of data
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Q5. Routing in Angular
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Routing in Angular allows for navigation between different components and views within an application.
• Angular's router module provides a way to define routes and their corresponding components.

• Routes can be configured with path, component, and other properties.

• RouterOutlet is used to display the component associated with the current route.

• RouterLink is used to navigate to different routes.

• Child routes can be defined to...read more
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