D3.js Jobs: Top 100 Interview Questions

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D3.js Jobs: Top 100 Interview Questions


D3.js Jobs: Top 100 Interview Questions 

1) Define D3.js?

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.

2) What does D3 stand for?

D3 stands for Data-Driven Documents

3) 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 New York Times for a while and is now independently working on D3.js.

4) Why use 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.

5) How D3.js identify which elements to operate?

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

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

6) Explain selections in D3.js?

D3 implements a declarative approach, operating on arbitrary sets of nodes called selections.

7) Explain, what is the use of the “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 to eliminate outgoing nodes that are no longer required.

8) List Type of sliders are available in D3.js?

There are 7 types of the slider are available in D3.js, they are

  • Default slider
  • Slider with the start value
  • Slider with slide event: 0
  • Slider with default axis
  • Slider with custom axis
  • Slider with min, max, and step values
  • Vertical slider

9) Explain transition is 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) List the command to interpolate two objects in D3.js?

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

11) which is the correct way to use XML file for d3?

You need to use the "d.value" instead of "d". Your sample data is just an array of numbers, but your JSON data is an array of objects with a "value" attribute.

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

To create scales showing the linear relationship between the output and input we use d3.scale.linear() and d3.scaleLinear(). The domain and range of the scale are set by default at the interval (0,1) which expresses the function y = x. It can be used for flipped range, nice bounds, round ranges, non-numerical range, camping, etc.

There is a minor difference between d3.scale.linear() and d3.scaleLinear() which is on the basis of its use.

  • If you want to create a d3.js linear scale on version 3 then use API d3.scale.linear()
  • If you want to create a d3.js linear scale on version 4 and 5 then use API d3.scaleLinear()

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