Java Ui Developer Interview Questions And Answers – Front-end development is considered to be the most successful area, especially for people who are new to web development. Since it mostly requires basic skills like HTML, CSS, JavaScript and some server knowledge, many beginners find front-end development a good way to start a full development career. However, the field of front-end development is comprehensive and includes different techniques and tools. Therefore, the questions asked about a front line developer position are varied and can be in different areas.
In the technology world, programmers need to efficiently code and translate customer requirements into applications. When interviewing any leading developer, the interviewer is looking for this kind of enthusiasm from candidates. It is known that leading IT companies are looking to hire top developers who are responsible for building and managing applications that are interactive and responsive across all devices, keeping customer convenience and simplicity in mind.
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If you are looking for a top developer job and you don’t know how to prepare for the interview, don’t worry because this article will shed light on all the complicated and confusing questions that interviewers ask. ti These questions will give you a better idea of what employers want to know. Interview questions for freshers and experienced individuals are discussed here.
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Front-end development refers to an area of web development that focuses on what users see at the end. It converts code created by back-end developers into a graphical interface, ensuring that data is presented in a simple, easy-to-read format. Without front-end development, all that can be seen on a website or web application is unintelligible code. As front-end developers, people without a coding background can easily understand and use web applications and websites. What you see when you visit Canvas, Facebook, Google Apps, and other web applications are collaborative products from front-end and back-end developers.
Front-end developers have a lot more on their plate than making sure users can understand and use a web application’s graphical interface effectively. For example, front-end developers need to consider whether a web application or website is active on different devices. Please note that operating systems (OS) and screen sizes vary. Users can get Windows tablets, MacBooks and Android devices. The job of the front-end developer is to ensure that apps or websites work properly, regardless of the type of device and operating system. Advanced developer users may prefer different browsers. In addition, front-end developers must carefully design a website that works in Mozilla Firefox, Chrome, Safari, Microsoft Edge, Internet Explorer, and Opera.
Leading developers use various web technologies to transform encoded data into user-friendly interfaces. These include Cascading Style Sheets (CSS), JavaScript, and HyperText Markup Language (HTML). These technologies mentioned below must be familiar to front end developers.
Within a paragraph, the tag is used to apply CSS styling to certain words with a selected font.
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In the div tag, we use a border with color pixels of a certain width and height to emphasize the foreground color file.
An open-source front-end JavaScript library, ReactJS is primarily used for building user interfaces, especially in single-page applications. Also, it is used to handle the visual layer of web and mobile apps. Reactor allows developers to build large web applications that can handle data without having to reload the page. The main goal of React is to be fast, scalable and easy. It works only in the user interface of the application, and corresponds to the view in the MVC pattern. It can be used in conjunction with other JavaScript frameworks or libraries such as Angular JS in MVC.
The main responsibility of the image engine is to display the requested page on the browser screen. The rendering engine can display images and XML and HTML documents. If you use additional plugins, the engines can also display different types of documents, including PDFs.
CSS divides the page into cells and manipulates the HTML content using these cells. Cells allow CSS to highlight different elements in different parts of the web.
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JavaScript’s inheritance is different from many other programming languages. JavaScript’s object system is prototype-based, not class-based. Objects in JavaScript are just pairs of values and names (keys). When it comes to inheritance, JavaScript has only one structure: objects. Each object has its own properties, including connections to other objects that have native properties.
An iterative design process, user-centered design, allows designers to focus on the customer and their needs at every design stage. User-centered design involves using a variety of design and research techniques to transform users into products that are easy to relate to and use during the design process. User-centered design requires designers to understand user requirements by combining generative (eg, brainstorming) and survey (visits and surveys) methods and tools.
ClickJacking is a security attack where a user is tricked into clicking something when they think they are clicking something else. Attacks usually occur via HTML frames. ClickJacking is also considered a user interface refactoring. It makes the user think they are using the normal UI on the web page, but actually there is an invisible UI in the control. You can think of it as a user interface reset. When users tap something, assuming it’s safe, the implicit UI performs another action.
When building complex front-end applications with tons of codeless static assets, such as CSS, fonts, images, etc., then, of course, you should use Webpack because it has so many amazing benefits.
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If you have a small application that doesn’t have a lot of static resources and only need to create a single JavaScript file to help the client, then Webpack should be more than enough.
There are many things that can be responsible for reducing page load time. Let’s look at three of the best ways to reduce its loading time:
When an HTTP request is sent by a user to a server, the user’s browser also sends additional information about receiving the language. The server then reads the HTTP request with the Receive Language header and sends a copy of the document with the correct language and declares the language attribute in the HTML tag.
14. Why did we use the data attribute in HTML, and why is it now recommended not to use it?
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Typically, the Data-* HTML attribute is used to collect arbitrary data specific to an application or web page. This personal data is used to customize JavaScript for the user based on the user’s behavior on the website.
Nowadays, it is not recommended to use the Data-* attribute because the user can easily change the attribute using the browser control console.
In the JSON method, a hash is used to convert a JavaScript object into a string. JSON is a common structure for receiving and sending data between a web server and a client, and when we want to send data to a web server, the object must be a string.
Enhanced images are a commonly used process to enhance web page content. Image rendering processes are now used in modern web development, with user mobile data usage, synchronized HTML fragments, prioritization of visible content, and lazy loading of images.
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Srcset is used when you want to create multiple resolutions for an image on multiple devices. This improves the UI. Browsers display low-resolution images on low-end devices and high-resolution images on high-end devices.
Generally, the function name is defined in normal user defined functions when we define the function itself, but in case of anonymous function, the function name is not defined. Here we use the assignment operator and a variable to declare the function as an object, and then use that variable to refer to the function itself.
CSS image slider helps to display multiple images in one line. In short, CSS overlays combine multiple images into one large image. If a web page contains different images, then it increases the loading time because the browser has to send a separate HTTP request for each image, but with the help of browsers, we only have one image to request .
An attribute is an element of an HTML document, and an attribute is part of the Document Object Model (DOM).
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Here, the value and type are HTML properties, but when the browser reads the declaration and parses the code, it generates a DOM with various properties such as receive, autofocus, accessKey, baseURI, checked , child element count, alignment, alt, etc. childNodes, children, classList, className, properties and clientHeight.
== represents an abstract equality operator that checks if it exists
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