Are you searching for front end developer’s job? Don’t have any idea how to prepare for the interview? You should better not worry because this article comes up with all twisted and confusing questions that interviewers are more likely to ask you. Here I am discussing all front end developer interview questions that you are more likely to encounter during the interview. These front-end developer interview questions would give you an idea about what employers are expecting you to know. Some front end developer interview questions and answers for experienced individuals are also discussed here.
Read out the whole article to get an idea of what kind of frontend developer interview questions the interviewer is more likely to ask.
What you think are the fundamental skills Front end developer must have?
An effective front-end developer should have experience in the following languages:
Above are some of the basic skills that should be known to be a front-end developer. Other than all the technical skills a front-end developer must-have.
How you ensure that your web design is user-friendly?
A front-end developer should talk about working together with user experienced designers to conceptualize and design a webpage that promotes a user-oriented experience, you can test your website with a sample of real customers to guarantee optimal design and promising the web page is optimized for mobile devices also.
What is Clear?
A clear is used when you do not require an element to twist another element, for example, float.
Front end developers have to work on the code that was previously formed by employees or function as team part. Following are some of the practices that a front-end developer should adopt to make their code understandable for other employees and team members.
All of the above-mentioned practices would help the fronded developers to make their code more readable and understandable.
What do you know about CSS float?
Float is used when you required to keep your web page element pushed to the left or right and make all other elements cover around it.
What is the main difference between Prototypal and Class inheritance?
What is CSS Rule?
CSS rules are applied by the web browsers to a file to affect the way it is displayed. A CSS rule is formed from:
What is Sass?
Syntactically Awesome Stylesheets also known as Sass is a CSS preprocessor that elegance and adds power to the basic language. It lets you use nested rules, variables, inline imports, mixins, etc. the syntax should be compatible with CSS. Sass supports to organized the large stylesheets, and keep the small stylesheets up and running.
The CSS preprocessor is also a scripting language that widens CSS by permitting the developers to use one language to write code and then accumulate it in the CSS.
What’s the difference between “normalizing” and “resetting” CSS? Which one you would choose?
It is a nice idea to select resetting when you have a very unconventional or customized website design that I want to do my own designing, there is no need for any default styling to be well-maintained.
Explain HTML meta tags.
What is the difference between div and span?
For bonus points, it is illegal to put a block element in an inline element, and though div can have a p tag, and a p tag can have a width, for span, it is not possible to have a p or div tag inside.
What is ReactJS?
What are the benefits of REST web services?
Following are some of the benefits of REST web services:
What Is Load Balancing?
Load balancing is a very easy method for allocating capacities across numerous clusters or machines. The most simple and common algorithm of load balancing is called Round Robin. In this type of load balancing the request is divided in circular order ensuring all machines get an equal number of requests and no single machine is overloaded or underloaded.
What is meant by SOLID? Explain its principles?
S.O.L.I.D stands for the first five principles of the object-oriented design by Robert C. Martin.
Name some basic elements of design
What is user-centred design?
User-centred design is said to be an iterative design procedure that allows the designers to focus on the customers and their requirements in each design process phase. The user-centred design calls for linking users in the design process throughout a variability of design and research methods so as to make highly accessible and usable products.
User-centred design requires that designers use a combination of investigative (interviews and surveys) and generative (such as brainstorming) ways and instruments to build an understanding of user requirements.
What is ClickJacking?
ClickJacking is a security attack in which the user fools to click on something while they think they are clicking on something else. The attack is most happened by the HTML frames.
It is also known as the user interface redressing. It makes the user think that they are using a normal user interface in the web page, but actually, there is an unseen user interface in control; you can say that the user interface has been redressed. When users click something, thinking it is secure and safe, the hidden user interface performs another action.
Tell me when and Why should I Use Webpack?
While making a complex Front-End application with a lot of non-code static possessions, for example, fonts, images, CSS, etc, then yes, you should use Webpack as it a lot of great benefits.
Why should we use jQuery?
jQuery is a good option to choose because of the enormous benefits it holds.
Why HTML DOCTYPE is important?
DOCTYPE is like an instruction to web browser concerning in which markup language version the page is written. The declaration of DOCTYPE should be the first thing in a document of HTML, before <html> tag. The declaration of doctype points to a Document Type Definition. It offers rules for the markup language, so it allows the browser to understand the content properly.
Tell me about a Callback Function?
When you use inline scripts, your HTML code will weigh higher, while external scripts decrease the size of HTML file that helps to fast webpage interpretation.
Tell me about Cors and how does it work?
New HTTP headers are also added by CORS that offers access to allowed domains. For HTTP approaches except GET (or POST with some types of MIME), the requirement orders that browsers should use HTTP OPTIONS request header to petition a list of supported approaches from the server. A real request can be submitted. Servers can inform customers whether “credentials” (including HTTP and Cookies Verification data) must be shown with requests.
Why We Use the W3C standard code?
The goals of the W3C Standard Code are to guarantee cross-platform compatibility and compact sizes of file. These standards focus to separate “formatting ” from “content ” by applying CSS. It makes development and maintenance easier.
How to optimize the page through front end technology or code?
Following are some of the best practices of front-end technology that allows you to optimize the web page.
What is the difference between Block, Inline, Box-sizing and Inline-block?
Tell Me What Do You Know What Is A Closure?
Closures are usually functions, expressions that can function with a set of variables within a specific context. To make it easier, inner functions concerning the local variables of outer function generate closures.
On a <script> tag, what are async and defer attributes?
If no attribute is present, the script is synchronously downloaded and executed and will stop analyzing the document until it has done execution of the (default behaviour). Scripts are executed and downloaded in the same order they come across.
The script is downloaded by the defer attribute whereas the file is still analyzing and waits until the file has done parsing before execution, equals to executing in a DOMContentLoaded event auditor. The scripts of deferring will be executed in order.
The script is downloaded in the async attribute during document parsing but the parser will pause for script execution before it has completely done parsing. The async scripts will not automatically execute in order.
Within the same scope, each variable name should be unique. We can also nest one scope inside another scope. In this case, the code of the innermost scope has access to the variables from another scope.
If Node.js is single-threaded, how it manages the concurrency?
Node offers one thread to programmers that can allow them to write the code easily without any bottleneck. Node inside uses numerous POSIX threads for numerous input and output operations, for example, Network calls, DNS, File, etc.
Once Node gets input and output request it uses or makes a thread to achieve that input and output operation and when the operation is completed, it shoves the outcome to the event queue. In doing so, the event loop executed and checks the queue and if the Node’s execution stack is empty formerly it adds the outcome of the queue to execute the stack. In this way, the concurrency is managed in the Node. S, it can be said that the A front-end developer should have good experience in HTML, CSS and JQuery. It is important for a frond end developer to know about OPP and PHP. Web pages should be conceptualized based on user experience. Front-end developer should discuss the use of code organization and comment. The CoffeeScript allows you to express program with a shorter code than JavaScrip.
All of the above questions are the most frequent ask interview questions for front end developer. In this article, I have mentioned UI interview questions, java UI interview questions and web development interview questions and answers that can help you in preparation for the interview.