Top 8 D3 Js Interview Questions And Answers

 

1) What is D3.js?

D3.js is a JavaScript library for manipulating documents based on data. D3 helps to bring data to life using HTML, SVG, and CSS. It uses digital data to drive the formation and control of dynamic and interactive graphical presentation, which runs in web browsers.


2) What are the key features of D3.js?

Following are the key features of D3.js:

● D3 binds arbitrary data to a Document Object Model (DOM), and then apply data-driven transformations to the document.
● It efficiently manipulate documents based on data.
● D3 is extremely fast
● D3 supports large datasets and dynamic behaviors for interaction and animation
● It increases the code reusability


3) When to use D3.js?

D3.js can be used where data visualization is the best way to understand, represent and analyze the data. Example viewing huge data reports of account detail, e-commerce budgeting, population, etc.


4) What are the different scales in D3.js?

Following are the different scales in D3.js:

Quantitative Scales: These scales have a continuous domain like dates, times, real numbers etc.
Linear Scales: It converts one value of the domain interval into a value in the range interval.
Ordinal Scales: These scales are for separate domains like categories, colors, names etc.
Power and Logarithmic Scales: It is used for exponentially increasing values like log,power,sqrt etc.
Identity Scales: It is good to be used for pixel values.


5) What is Domain in D3.js?

Domain is the start and end of your dataset in D3.js. It can be any value that can be compared in JavaScript. Domains will change if the dataset changes.


6) How to create simple axis in D3.js?

Below is the command to create simple axis in d3.js:

var xAxis = d3.svg.axis()


7) How to set several classes at once in D3.js?

Here is the command to set several classes at once in d3.js:

selection.classed({ 'foo':true, 'bar': false})


8) How to call XML file in D3.js?

Below is the command to call XML file in d3.js:

d3.xml(url[mimeType][,callback])


 

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