Rapid UnderscoreJS

Harness the power of the extensive range of functionalities that come with UnderscoreJS
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  • Lectures 13
  • Length 1 hour
  • Skill Level All Levels
  • Languages English
  • Includes Lifetime access
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    Available on iOS and Android
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About This Course

Published 5/2015 English

Course Description

UnderscoreJS is a library of utility functions for JavaScript that helps to minimize the complexity most users face in building programs, that is, simplifying their JavaScript code. It can be used with any other library or framework and provides many useful methods for this very reason. It works great as an addition to jQuery, AngularJS, BackboneJS, or any other framework you might be using, or you can use it with plain old JavaScript.

Rapid UnderscoreJS is a quick introduction to making the most of the UnderscoreJS library. Using a practical example project it shows you not just how but why you would want to use UnderscoreJS' methods.

We'll start off by learning what the UnderscoreJS library is and why you would want to use it, and discover how to incorporate UnderscoreJS into an existing Browser or NodeJS-based project. Further, we will dive deeper into the UnderscoreJS concepts that can help us deal with arrays and objects using Underscore's functions for filtering, grouping, and sorting. We will explore JavaScript's “this” context to manage binding and see how new functions can easily be made by partially applying the existing functions. We'll control the running of a function using debounce, throttle, once, and after, and also how this leads to simplifying techniques when building user interfaces and dealing with outside data sources. Finally, we'll learn Underscore's HTML templating abilities and chaining and finish up with a brief taste of libraries that extend Underscore.

By the end of this course, you will understand how UnderscoreJS helps you to efficiently develop web applications using a functional approach to JavaScript.

About the Author

Thomas Parslow is a Brighton-based freelance developer specialising in JavaScript and Python. He has been writing software for over almost two decades and has worked in both IT industry and academia for applications ranging from robotics control and computer vision through to touch surfaces and web applications. Thomas is a co-organizer of the successful learn-to-code workshop Coding For Humans and regularly speaks at technical events.

What are the requirements?

  • Rapid UnderscoreJS is aimed at JavaScript web developers who have experience building web applications

What am I going to get from this course?

  • Develop an International Space Station application using the highly useful UnderscoreJS library
  • Integrate UnderscoreJS with your browser or NodeJS-based JavaScript project
  • Process and transform arrays using Underscore’s iteration capabilities for performance enhancement
  • Group, sort, and filter of data for efficient data management
  • Use UnderscoreJS templating to simplify your HTML generation
  • Get a glimpse of other libraries such as Lodash that extend Underscore

Who is the target audience?

  • Rapid UnderscoreJS is aimed at JavaScript web developers who have experience building web applications, helping them to expand their skill set and take advantage of everything that UnderscoreJS has to offer.

What you get with this course?

Not for you? No problem.
30 day money back guarantee.

Forever yours.
Lifetime access.

Learn on the go.
Desktop, iOS and Android.

Get rewarded.
Certificate of completion.


Section 1: Introduction to Underscore
Discover why you might want to learn about UnderscoreJS.

Make UnderscoreJS available in your page or module. This will allow you to start using UnderscoreJS.

Section 2: Processing Arrays

Use UnderscoreJS's "map" and "each" methods to loop over and transform the data about the ISS flyover times.


Combine weather data from the weather API with the flyover times for the ISS.


Group the flyover times by day for ease of use, and sort them by cloud cover to make it easy to find the perfect viewing time.

Section 3: Dealing with Objects

Show a summary of the weather conditions for ISS flyovers over the next few days.


Show a list of the astronauts currently in the ISS.

Section 4: Functions

Refactor your code for your International Space Station flyovers app to make use of an object.


Allow the user to type in coordinates in order to check flyovers near them.


Request for ISS flyover and weather data in parallel to speed up the app.

Section 5: Wrapping Up

We'd like to output more complex HTML for flyovers so that we can make it more pretty.

How can your long, complex function be simplified and made more clear?

Get a brief taste of libraries that extend Underscore.

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Instructor Biography

Packt Publishing, Tech Knowledge in Motion

Packt has been committed to developer learning since 2004. A lot has changed in software since then - but Packt has remained responsive to these changes, continuing to look forward at the trends and tools defining the way we work and live. And how to put them to work.

With an extensive library of content - more than 4000 books and video courses -Packt's mission is to help developers stay relevant in a rapidly changing world. From new web frameworks and programming languages, to cutting edge data analytics, and DevOps, Packt takes software professionals in every field to what's important to them now.

From skills that will help you to develop and future proof your career to immediate solutions to every day tech challenges, Packt is a go-to resource to make you a better, smarter developer.

Packt Udemy courses continue this tradition, bringing you comprehensive yet concise video courses straight from the experts.

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