25+ D3.js Interview Questions

D3.js aka Data-Driven Documents is a data visualization platform that has a set of tools for processing data-based documents. It is an app based on JavaScript, created by Mike Bostock, and popular for making data visualizations on the internet. The D3.js library enables the users to handle the elements of a webpage under the scope of data. These elements can be in the form of HTML, SVG, Canvas or can be created, modified and removed that depends on the data content. Now, let's come to its features such as DOM manipulation, Voronoi Diagrams, Maps, and topo, Built in-element inspector and many more. These features amaze the users to use D3.js over other similar libraries. Besides these, it has enthralling benefits such as rich toolset, large community, versatility, etc. that makes it popular among companies as well as in developers.

Well, we can’t explain all about D3.js in an introduction, so scroll down to read the full article. You will also find the online interview questions on it that will help you to crack any interviews. So, start it now and get equipped yourself with the latest D3.JS interview questions.

    D3.js vs High Charts. Which is better?

    D3.jsHigh charts
    It is a JavaScript library used for processing data-based documents.It is a charting library which is written in JavaScript.
    It applies visualization components and a data-driven approach to manipulate DOM.It offers an easy way of adding interactive charts to web applications.
    The available supports for the customers are tickets and Training.Supports available in High charts are Email, tickets, and training.

    Pros of D3.js:

    • Rich Toolset: The most amazing pro of D3.js is its strong toolset for data-driven visuals. As the D3.js is a data visualization platform so the tools allow users to add special features and also to reuse the codes. Even, users can freely make any data visualization frameworks and the output is always in favor of the users. Moreover, the full control is in hands of users, they can create, mold and even, build data visuals as per their requirement.
    • Online Examples: It is always a plus point for a user if he/she gets online examples. Well, good news for D3.js users, you will get an abundant number of examples written by the authors that are easily available online.
    • Adaptable: D3.js is so adaptable and streamlined that it easily works with other web technologies and even handle the Document Object Model.  These features enable companies to have great advantages over other tools. Besides, D3.js can also support large visualizations and SVG-only libraries.
    • Large Community: Having a large community means easy and fast solutions to your problems. Thanks to the D3.js large community, it provides answers to its users. There is also a huge number of examples and plugins that community writes online to provide them to the users. The community is active enough that results in fast responses to your queries. Until now, D3 has been used for more than 9k sessions on GitHub, this means developers are constantly working to improve it. 
    •  Massive library: You may wonder but yeah, D3.js indeed provides a massive library for its users. If you search for one thing, you will get hundreds of examples on that topic. Isn't that amazing? This helps a lot to users as they get a vast amount of knowledge to use it in their projects.
    • Backward Compatibility:D3.js is designed for modern browsers, so supports IE9 and above. Also, it supports all other modern browsers too.

    Cons of D3.js:

    • Steep learning curve: It is tricky to learn D3.js and time consuming too for many users. D3.js is very flexible more than any other JavaScript visualization library which increases complexity. It is always better to choose another library if you just want to create some quick charts. As it is suitable for large projects so always prefer it based on complexity.
    • Selections: Selections are admirable in D3.js but somewhat hard to grow. They are powerful but need new developers to get up to speed. Also, if they are used in the larger applications, then this will result in different patterns than the rest for some portion of code.