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Description

Underscore.js is one of the most popular modern JavaScript libraries used for functional programming. It can be used as a base for building complex JavaScript applications in a sustainable manner and for building other JavaScript libraries. It embraces functional programming principles but is not opinionated and can be used with imperative, object-oriented, functional, or other programming styles. This book explores how to use Underscore.js to power your code and understand modern JavaScript development concepts while applying a lightweight and efficient workflow to build applications. The book starts with an incremental Underscore.js introduction by exploring key JavaScript concepts. You will then explore the basic features of Underscore.js in action and establish a lightweight development workflow that allows the provided examples to be guided by tests. The book then covers the functionality of Underscore.js with in-depth examples and explanations for understanding and applying the Underscore.js API. You'll also learn how to use Underscore.js as a base for your own modules and libraries within an object-oriented or functional programming style, and will be able to explore Underscore.js use cases in different environments. Eventually, you'll learn about libraries that are closely related with Underscore.js, how to share code between client and server, and how to prepare for the upcoming JavaScript standard ECMAScript 6.

What you will learn

Reference and call Underscore.js functions using a modern JavaScript development workflow

Apply Underscore.js to JavaScript arrays, objects, and functions

Take advantage of objectoriented or functional programming techniques with Underscore.js

Leverage Underscore.js to create code that targets client, server, or database contexts

Extend Underscore.js functionality with other closely related libraries

Reuse Underscore.jsbased code between client and server applications

Prepare for the upcoming JavaScript standard ECMAScript 6 and support older browsers

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SuJo Dec 25, 2015

This book was very easy to digest and follow along, all of the information is organized rather well. I appreciated the paradigm on OOP programming, and I really can't fault the book much. It was probably just too short for my taste, and I would have loved to see an overall project worked during the course of the book. But I felt confident in reading and doing that I can put the puzzle pieces together for myself.Packt has a global $5 ebook sale right now so sorry Amazon I had to buy it there.

Amazon Verified review

ruben Dec 26, 2015

Excelent resource Learning UnderscoreJSVery interesting book, I understand very simple this tool for programming the applications in JavaScript, the book is well-organizedin all the chapters. I cover the main points to start developing Software with this new library in Java Script software.The book starts with an incremental Underscore.js introduction by exploring key JavaScript concepts. You will then explore the basic features of Underscore.js in action and establish a lightweight development workflow that allows the provided examples to be guided by tests. The book then covers the functionality of Underscore.js with in-depth examples and explanations for understanding and applying the Underscore.js API. You'll also learn how to use Underscore.js as a base for your own modules and libraries within an object-oriented or functional programming style, and will be able to explore Underscore.js use cases in different environments.Ruben.

Perry Nally Dec 30, 2015

Learning Underscore.js is a perfect introduction to functional programming and ECMAScript 5. I learned faster through comparing what I already knew in regular Javascript with the same function using Underscore.js methods. Underscore.js is very powerful and I'm excited to make use of it in my own sites. Though ECMAScript 6 is almost out, you'll still be able to use Underscore.js, but look for the updated Underscore.js library at that time.I can see why frameworks that use Underscore.js, like Backbone.js, are so popular. Learning Underscore.js is an easy read with concepts plainly described for beginner and veteran js developers.

Winston Dec 30, 2015

This book is not for the javascript NOOB. Underscore.js is a JavaScript library which provides utility functions and POWER for common programming tasks like those found in popular languages like Ruby. The author does a great job of explaining the Underscore library and its uses throughout the book. Readers will benefit from the authors explanation of Underscore.js in a test driven environment. Great book to get started.

Dustin Marx Dec 16, 2015

"Learning Underscore.js" provides a comprehensive introduction to the JavaScript library Underscore.js. The book consists of seven chapters spanning approximately 200 substantive pages. The first few chapters introduce Underscore.js and cover the majority of its features. The fourth chapter looks at applying Underscore.js with object-oriented and functional paradigms and the fifth chapter describes applying Underscore in the contexts of web browser, server (Node.js), and database (MongoDB and PostgreSQL). The sixth chapter describes Underscore's relationship to other libraries such as Underscore-contrib and Babel and Underscore's relationship to the ECMAScript specification. The final chapter looks at using Underscore applications with other JavaScript tools and frameworks such as CommonJS, Browserify, Jasmine, and Gulp to build, deploy, and test Underscore applications."Learning Underscore.js" covers more than just Underscore.js. It also briefly describes lodash and it discusses the emerging ECMAScript 6 implementations and how Underscore pertains to ECMAScript 5 and ECMAScript 6 applications.There are numerous code listings in "Learning Underscore.js" that are black text on white background with no color syntax and no line numbers in the PDF version of the book Packt Publishing provided to me. I recommend downloading the code separately to use your favorite editor or IDE to view the code or use the Cloud9 links referenced in the book to view the code. The book provides numerous references to additional resources (many of which are freely available online) with additional background details and specific topics."Learning Underscore.js" is an introductory book that manages to provide a comprehensive introduction to Underscore.js and explains Underscore's relationship to the ECMAScript specifications and the future of JavaScript.

Learning UnderscoreJS: Explore the Underscore.js library by example using a test-driven development approach

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