Book Image

Learning ClojureScript

By : W. David Jarvis, Allen Rohner
Book Image

Learning ClojureScript

By: W. David Jarvis, Allen Rohner

Overview of this book

Clojure is an expressive language that makes it possible to easily tackle complex software development challenges. Its bias toward interactive development has made it a powerful tool, enabling high developer productivity. In this book, you will first learn how to construct an interactive development experience for ClojureScript.. You will be guided through ClojureScript language concepts, looking at the basics first, then being introduced to advanced concepts such as functional programming or macro writing. After that, we elaborate on the subject of single page web applications, showcasing how to build a simple one, then covering different possible enhancements. We move on to study more advanced ClojureScript concepts, where you will be shown how to address some complex algorithmic cases. Finally, you'll learn about optional type-checking for your programs, how you can write portable code, test it, and put the advanced compilation mode of the Google Closure Compiler to good use.
Table of Contents (15 chapters)
Learning ClojureScript
About the Authors
About the Reviewer

Raw DOM manipulation and events handling

Thanks to the interoperability with JavaScript, we can translate, mostly word by word, the same very mutable JavaScript logic into ClojureScript programs. You'll find yourself select DOM nodes using their IDs or mutating their properties to change their appearance on the browser for instance. In JavaScript, handling events corresponds to setting callbacks, that is, assigning functions - called callbacks - to special properties corresponding to those events (like onmousemove, and so on). You can follow the same logic in ClojureScript, setting event handlers by mutating those same DOM nodes event descriptor properties.

You only have to remember that if you want to access a DOM's element property, you would write:

( a-js-object) 

And to mutate these properties properties, you would have to make use of the set! function:

(set! (-.a-property a-js-object) 

Although this approach means somehow falling back to raw JavaScript, all of the...