October 2012
Intermediate to advanced
113 pages
2h 51m
English
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Chapter 4. ClojureScript Basics
ClojureScript is a simple language, which is to say that it is based on a small number of fundamental concepts. If you have only written programs in imperative, object-oriented languages such as Java, C++, and JavaScript, then some of these concepts may be unfamiliar to you at first. However, by learning those concepts, you will be rewarded with a powerful new programming tool.
ClojureScript versus Clojure
At the language level, ClojureScript is designed to mimic Clojure as much as possible. However, neither ClojureScript nor Clojure makes any attempt to hide operational details of the underlying host platform, JavaScript or the JVM, respectively. As a result, there will be differences between the two languages wherever their host platforms are involved:
Calls to host methods or classes
Built-in types such as strings and numbers
Built-in operations such as arithmetic
Concurrency and threading (JavaScript is single-threaded)
Performance
At this time, ClojureScript does not implement all of the Clojure language. In particular, ClojureScript does not include most of the concurrency features for which Clojure is so well known; because JavaScript VMs are single-threaded, these features are less important. There are also features of Clojure that have not yet been implemented in ClojureScript simply because work has not yet been completed.
Clojure itself is a young programming language (first released in 2007) but it has grown rapidly in stability, ease of use, and ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.