By Stuart Sierra, Luke VanderHart
The way to construct whole client-side purposes with ClojureScript, the Clojure language variation that compiles to optimized JavaScript. This hands-on advent exhibits you ways ClojureScript not just is analogous to JavaScript—without the flaws—but additionally helps the total semantics of its father or mother language. You’ll delve into ClojureScript’s immutable information buildings, lazy sequences, first class capabilities, macros, and aid for JavaScript libraries.
No past adventure with Clojure or ClojureScript is important. If you’re acquainted with JavaScript, HTML, CSS, and the DOM, you’ll quick become aware of that ClojureScript has a similar achieve as JavaScript, yet with extra power.
* commence writing ClojureScript code with the Leiningen construct system
* learn the way the ClojureScript compiler works to supply optimized JavaScript
* Use JavaScript features and libraries without delay from ClojureScript code
* discover capabilities in Clojure’s series library similar to map, decrease, and filter
* Use macros to outline new keep an eye on buildings or embed domain-specific languages
* bring together manually or script your individual workflow with ClojureScript’s compiler tools
* combine ClojureScript with Clojure at the JVM to construct robust client-server purposes
Read Online or Download ClojureScript: Up and Running: Functional Programming for the Web PDF
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Extra resources for ClojureScript: Up and Running: Functional Programming for the Web
Example text
An obvious way to do this is by assigning the new string to a variable at each step of the way: note • Assigning the new string to a variable at each step works, but it is cumbersome and creates far more variables than are needed. toLowerCase(); etc. You can shortcut this by relying on the fact that each of these formatting methods returns a string that is an object that, in turn, has its own set of formatting methods that can be called. fontcolor(“red”); The end result of this is the following HTML stored in finalString: my string In the following task you take a string and apply bolding, italicization, coloring, and sizing to it before displaying it: 1.
As browsers are supposed to do, they will just ignore the tag they don’t recognize, but all the content between the opening and closing tags will not be ignored and, therefore, will be displayed in the browser. n Task 2 you saw how to hide JavaScript code from non-JavaScript browsers by using HTML comments. The result is that browsers that don’t support JavaScript see nothing at all where the script block normally would be. However, there are cases where the purpose of the JavaScript code is essential to the page and users of non-JavaScript capable browsers need to be told that they are missing this vital part of the page.
Notes • • • You probably noticed that the first container is numbered 0. Like many programming languages, JavaScript starts counting at zero, so the first container in an array is numbered 0. You refer to containers in the array as arrayName[0], arrayName[1], arrayName[2], and so on. Each of these individual containers can be manipulated and used just like a regular variable. You can imagine an array as illustrated in Figure 20-1; here you see a set of boxes where each box is numbered and each box has something inside it.
ClojureScript: Up and Running: Functional Programming for the Web by Stuart Sierra, Luke VanderHart
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