D3.js interview questions

D3.js is defined as a JavaScript-based library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. D3's emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.

Data visualization Interview Questions and answers.

#1 Explain axes in D3.js?How to create d3.js axes without numbering?

#2 How D3.js identify on which elements to operate?

D3.js uses CSS-style selectors to identify elements on which to operate.
Example:

d3.selectAll("p").style("color", "white");

#3 List the command to interpolate two objects in D3.js?

d3.interpolateObject(a,b) command is used to interpolate two objects in d3.js

#4 How to calculate the area of the polygon in d3.js?

#5 Who developed D3.js?

Mike Bostock wrote D3.js based on his work during his Ph.D. studies at the Stanford Visualization Group. Mike worked at the The New York Times for a while and is now independently working on D3.js.

#6 What does D3 stand for?

D3 stands for Data-Driven Documents

Also Prepare: Frequently Asked Aurelia Interview Questions

#7 What is different between d3.scale.linear() and d3.scaleLinear().

#8 How to import XML data using d3.js?

#9 Explain transition in D3.js?

A transition is a selection-like interface for animating changes to the DOM. Instead of applying changes instantaneously, transitions smoothly interpolate the DOM from its current state to the desired target state over a given duration.

To apply a transition, select elements, call selection.transition and then make the desired changes.

For example:

d3.select("body")
  .transition()
    .style("background-color", "red");

#10 What is the best way to create the stacked chart in d3 js?

#11 List types of loops available in D3.js with syntax?

#12 How to alter zoom modes in d3 js?

#13 which is the correct way to use XML file for d3?

#14 Explain, what is the use of “Enter” and “Exit” selection in D3.js ?

In D3.js “Enter” selection is used to create new nodes for incoming data and “Exit” selection is used eliminate outgoing nodes that are no longer required.

#15 Why use to D3.js?

You can use D3 js because

  • D3.js lets you to build the data visualization framework
  • D3.js focuses on binding data to DOM elements.
  • D3.js is written in JavaScript and uses a functional style which means you can reuse code and add specific functions to your heart’s content.
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