Beyond Dawlish
Intro to JavaScript: Interview Questions & Careers
Introduction:
To begin with, JavaScript is a high-level, dynamic, and interpreted programming language. This language is primarily used for client-side scripting on the web. Along with this, it is a versatile language that can be used for both front-end and back-end development.
Career Opportunities in JavaScript
There is a huge demand for JavaScript professionals all across the globe, and over 14 million developers use JavaScript globally. In addition, JavaScript offers optimum versatility and helps in building web, mobile, desktop, IoT, and even AR/VR apps. Along with it, this programming language provides huge community support and comes with a massive open-source ecosystem. There is a huge demand for skilled JavaScript professionals in cities like Noida and Delhi. It is because these cities are major IT hubs, and they offer numerous job roles for skilled professionals. Along with this, one can find many institutes providing JavaScript Training in Noida. Here are some of the high-paying careers one can explore in JavaScript.
- Front-End Developer: These professionals have to build interactive user interfaces using HTML/CSS and frameworks like React, Angular, or Vue.js. They require skills like React Hooks, Redux, Responsive Design, and Webpack.
- Full-Stack Developer: As a full-stack developer, you will be responsible for developing the end-to-end web apps using JavaScript for both front-end and back-end.
- JavaScript Engineer (Specialized): They have to focus on the frameworks like React Native (mobile apps) or Electron (desktop apps). This job role requires skills like React Native, TypeScript, Electron, and Expo.
- Back-End Developer (Node.js): Their primary jobs include client-side logic, APIs, and databases using Node.js. Along with this, required skills are Nest.js, GraphQL, Docker, and AWS/Azure.
- UI/UX Developer Role: These professionals have to blend design and code to create visually appealing, user-friendly interfaces. They require skills like Figma, CSS-in-JS, and Animation Libraries (GSAP).
JavaScript Interview Questions
Here are are some popular javascript interview questions and answers you should explore before job interview.
What is the difference between let, var, and const?
The var is function-scoped, hoisted, and can be re-declared. The let is useful for blocking-scoped, not hoisted, and cannot be re-declared. On the other hand, const is useful for blocking-scoped and cannot be re-declared or reassigned.
What is a closure?
A function that retains access to its outer (enclosing) function’s variables even after the outer function has returned.
Explain event delegation
The event delegation. refers to a technique where a single event listener is attached to a parent element to manage events for its child elements.
What is Hoiesting?
JavaScript moves variable and function declarations to the top of their scope during compilation.
- Variables: var declarations are hoisted (initialized as undefined).
- Functions: Function declarations are fully hoisted.
How does this work in JavaScript?
- Global context: this refers to the global object (window in browsers).
- Object method: this refers to the object calling the method.
- Arrow functions: Inherit this from the encompassing lexical scope.
What is a Promise?
A promise refers to an object representing the eventual completion (or failure) of an asynchronous operation.
What is the event loop?
The event loop refers to a mechanism that handles asynchronous code execution by continuously checking the call stack and processing the callback queue.
What is the difference between forEach and map?
The forEach is for executing a function for each element. On the other hand, map returns a new array with transformed elements.
Conclusion
JavaScript is a highly sought-after skill in the tech industry, with a huge demand for professionals globally. With its versatility in building web, mobile, desktop, IoT, and AR/VR apps, JavaScript offers a wide range of career opportunities. To succeed in these roles, professionals need to have a strong grasp of JavaScript fundamentals. By acquiring JavaScript skills through JavaScript Online Training, professionals can unlock lucrative career opportunities and stay ahead.
