How Do You Ensure That Your Website Design Or Web Application Is Accessible And User
Front end developers need a strong grasp of usability and accessibility when theyre designing experiences for end-users. This question gives you insight into their knowledge of these standards and best practices. What to look for in an answer:
- First-hand experience implementing usability and accessibility standards
- A drive to create a web experience thats accessible to all end users
- Ways that the applicant has implemented usability and accessibility in their previous projects
I test my web applications on various browsers and devices to check whether the experience is usable on all devices. I also use popular screen reading software and other assistive solutions to see whether its accessible for all potential users.
What Is Data Binding And How Does It Work Which Data Binding Methods Does Angular Use
Data binding is a method of manipulating web page elements through the usage of a web browser. It’s utilized in interactive elements like forms, calculators, tutorials, and games on web pages.
Two-way Data Binding is used by Angular. Any modifications made to the user interface mirror the elements in the model state and vice versa.
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Why Do We Need A Router In React
A Router is used to define multiple routes and when a user types a specific URL, if this URL matches the path of any route defined inside the router, then the user is redirected to that particular route. So basically, we need to add a Router library to our app that allows creating multiple routes with each leading to us a unique view.
< switch> < route exact path=& rsquo /& rsquo & nbsp component=/> < route path=& rsquo /posts/:id& rsquo component=/> < route path=& rsquo /posts& rsquo & nbsp & nbsp component=/> < /switch>
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What Is Virtual Dom
- The Virtual DOM is the lightweight version of the Real DOM that React retains in memory.
- Because nothing is drawn on the screen when processing Real DOM, it is substantially slower than handling virtual DOM.
- When an object’s state changes, Virtual DOM updates only that object in the real DOM rather than all of them.
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Q #17 What Are Acid Properties
Answer: A single unit of work by accessing and updating the content in the database is described as a Transaction. Using Read and Write operations access to records from the database is handled by the transaction. The consistency in the database, before and after the transaction, is maintained by ACID properties.
- Atomicity: The transaction in the database takes place successfully or does not take place at all.
- Consistency: Before the transaction and after the transaction, the database remains consistent.
- Isolation: There occur independent multiple transactions without any interference
- Durability: The changes due to successful transactions are reflected even the system fails.
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What Is Functional Programming
It is important to learn functional programming concepts and train your mind to use those constructs while solving a problem. Functional programming teaches you to think about relationships between data rather than a set of instructions. Answer these questions during the interview to show that you understand basic functional programming concepts.
- What does closure mean in programming?
- What is a higher-order function in functional programming?
- What are pure and impure functions?
- What is idempotency, and where is it used?
- What is a monad in programming?
- How do you know if a function is composite?
- When is function currying used?
Explain Git Push And Git Pull
Git push is a command that pushes the contents of a local repository to a remote repository. It runs a push after it has changed a local repository to share the changes with remote team members.
Git pull is a command that pulls changes from a remote repository and merges them into the local repository. It’s made up of two commands: git fetch followed by git merge.
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Are You Familiar With Ecmascript
Make sure you know the differences between arrow functions and traditional functions. Also, the interviewer may ask different questions about ECMAScript modules and classes.
- What are the differences between arrow functions and function expressions?
- Are there any language structures that implement strict mode by default?
What Is The Significance Of Store In Redux
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How Do You Modularize Code In React
We can modularize code by using the export and import properties. They help in writing the components separately in different files.
//ChildComponent.jsxexport default class ChildComponent extends React.Component }//ParentComponent.jsximport ChildComponent from './childcomponent.js' class ParentComponent extends React.Component }
Optimizations Deep Dives And Adaptability Questions
Alrighty, were in the final stages of the interview now. Lets finish strong.
In this phase the interview will usually switch to a phase where the interviewer asks more probing questions. They will typically end up being how you would adapt the design to meet a new set requirements. Either functional, like how would we go about supporting real time collaboration? or non-functional, like how would we go about supporting 100x more data for larger customers?.
This is a good chance to demonstrate your technical depth on a particular subject and your adaptability. Theres no hard and fast rules here. What you discuss will depend on what the interviewer wants to probe more on. But its very likely the topic of frontend performance will come up. So youll want a solid understanding of performance fundamentals if you lack real experience in this area, to ensure you can discus this aspect in depth.
Here are some example questions you might expect to see in this phase of the interview:
A customer has raised a support ticket about bad performance and you are tasked to investigate, what do you do ?
Similar to the initial question they will usually be open ended to see how you take an ambiguous problem statement and drive towards a solution. In this case theyre looking for general debugging ability and performance knowledge. Which can roughly be broken down to:
To recap this phase of the interview
What Do You Understand By Web Accessibility
Web Accessibility is a way to design, develop, and code websites and web tools that people with disabilities can also use. It makes using the technology easy for certain people who have difficulties hearing or seeing. It ensures that the web is also usable by people with a wide range of disabilities.
Q #15 List Ways To Manage Sessions In Java Using Jsp And Servlets
Answer: In modern web applications, the session tracking feature helps the server to remember clients and previous visitors with a session for each user. It helps in the personalization of profiles, safety, and security for eCommerce applications.
You can manage sessions for Java application build with JSP and Servlet in the following four ways:
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In An Image Tag What Is The Benefit Of The Srcset Attribute
srcset is utilized when we wish to generate several resolutions of the exact image on several devices. This improves the UI. The browser will display low resolution on low-end devices, and high resolution of an image on high-end devices.
< img srcset="picture_low.jpg 480w, picture_high.jpg 800w" sizes=" 480px, 800px" src="picture_high.jpg" alt="Elva dressed as a fairy">
What Is An Ngmodule
NgModules are containers that reserve a block of code to an application domain or a workflow. @NgModule takes a metadata object that generally describes the way to compile the template of a component and to generate an injector at runtime. In addition, it identifies the module’s components, directives, and pipes, making some of them public, through the export property so that external components can use them.
Putting It All Into Practice
Well done if youve made it this far. This guide was written to help you think about the frontend system design interview at a higher level. Breaking down what tech companies are actually looking for, and how to structure your approach to the interview.
If you would like to see examples of applying this framework to a set of real world problems you can sign up to the newsletter below. And also early access to the Frontend Mastery course where we go into deep technical detail on all of the areas we only had the time to briefly mention in this guide.
How Do I Prepare For A Front
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How Soon After Signing Up Would I Get Access To The Learning Content
Post-enrolment, the LMS access will be instantly provided to you and will be available for lifetime. You will be able to access the complete set of previous class recordings, PPTs, PDFs, assignments. Moreover the access to our 24×7 support team will be granted instantly as well. You can start learning right away.
What Do You Understand By Lazy Loading
After your application instantiates a component or directive by calling its constructor, Angular calls the hook methods you have implemented at the appropriate point in the lifecycle of that instance.
Angular calls these hook methods in the following order:
ViewChild and ContentChild are used for component communication in Angular, for example, if a parent component wants access to one or multiple child components.
- A ViewChild is any component, directive, or element which is part of a template.
- A ContentChild is any component or element which is projected in the template.
In Angular exist two different DOMs:
- Content DOM which has only knowledge of the template provided by the component at hand or content injected via < ng-content> .
- View DOM which has only knowledge of the encapsulated and the descending components.
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What Are Pure Pipes
These pipes are pipes that use pure functions. As a result of this, a pure pipe doesn’t use any internal state, and the output remains the same as long as the parameters passed stay the same. Angular calls the pipe only when it detects a change in the parameters being passed. A single instance of the pure pipe is used throughout all components.
What Are Higher Order Components
Higher Order Component is an advanced way of reusing the component logic. Basically, its a pattern that is derived from Reacts compositional nature. HOC are custom components which wrap another component within it. They can accept any dynamically provided child component but they wont modify or copy any behavior from their input components. You can say that HOC are pure components.
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How To Prepare For Your Front
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What Do You Believe Are The Most Important Skills To Possess As A Solutions Architect
If your interviewer asks you this question, they typically want to assess your understanding of the interpersonal requirements for a solutions architect role. As a solutions architect, you’re usually a senior member of a software development team, so it can be an excellent idea to discuss skills such as leadership, management, communication and problem-solving. Solutions architects typically require many skills, so there isn’t necessarily a right or wrong response. You can detail many skills, provided you explain why they’re important for the role.
Example answer:’I believe a solutions architect requires an abundance of interpersonal skills, but the two most important skills are communication and problem-solving. Communication is often crucial for a solutions architect, as they regularly discuss project activities with varying colleagues and clients. Problem-solving is their primary function in providing technological solutions to businesses’.
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Can You Write Sql Queries
Software engineers should know basic SQL. You don’t need to know about optimization, performance, database setup, or other complicated areas, but you should be able to write an SQL query.
It is essential to know at least the basic SELECT, INSERT, DELETE and UPDATE functions and understand relational databases. Thats why all front end developer interviews should include at least one question regarding that.
- What types of relationships are possible in a relational database?
- How would you describe the concept of database normalization to a non-developer?
What Are Filters In Angular Name A Few Of Them
Filters are used to format an expression and present it to the user. They can be used in view templates, controllers, or services. Some inbuilt filters are as follows.
- date – Format a date to a specified format.
- filter – Select a subset of items from an array.
- Json – Format an object to a JSON string.
- limitTo – Limits an array/string, into a specified number of elements/characters.
- lowercase – Format a string to lowercase.
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What Frameworks Do You Work With
Frameworks provide a structure in which software engineers can build programs for a specific platform. Frameworks are needed when code for an application or program seems to have zero structure and rough functionality, because as frameworks, they mandate how your code is structured and how it will run. Thats why interviewers often mention frameworks in senior front end developer interview questions.
- What is React used for?
- What are the advantages and disadvantages of Virtual DOM?
- Are TSX and JSX the same?
- How do props work in React?
- What are Hooks in React?
- What is NextJS used for?
Explain Box Sizing Property
Box Sizing property defines how the height and width of a box are calculated.
Content Box – The default width and height apply only to the elements content. Padding and border are added outside the box.
Padding Box – You add the dimensions to both elements content and padding. It adds the border outside the box.
Border Box – The dimensions are added to the content, padding, and border.
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What Is The Difference Between Git Merge And Git Rebase
Git merge, and Git rebase are both used to integrate changes from one branch into another. Git rebase moves a feature branch into a master while the Git merge adds a new commit, preserving the history.
According to the official Git manual, the Git Rebase “reapplies commits on top of another base branch”. On the other hand, Git merge “joins two or more development histories together”. In other words, we can see that the Git merge preserves history as it happened, while the Git rebase rewrites it.
For example, if you are working on a new feature in a dedicated branch, and another team member pushes new commits to the master branch, the Git merge will incorporate new commits into your feature branch. Every time you need to include modifications, you would require an extra merging commit. On the other hand, in Git rebase, you can rebase the feature branch into master instead of merging it. This includes all the new commits in the master branch and rewrites the project history by creating brand new commits for each one in the original branch.
In Angular What Are Promises And Observables
While both concepts in Angular deal with asynchronous events, Promises deal with one at a time, whereas observables deal with a sequence of events over time.
- Promises are objects that emit only one value at a time. They go into effect right once they’re created and can’t be stopped. They are Promises to the child Push Errors.
- Observables – Observables are only executed when the subscribe method is used to subscribe to them. Over a period, they emit multiple values. They aid in the execution of tasks such as forEach, filter, and retry, among others. Subscribers receive errors as a result of their actions. The listener stops receiving new data when they perform the unsubscribe method.
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