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  • Book Overview & Buying The Clojure Workshop
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The Clojure Workshop

The Clojure Workshop

By : Joseph Fahey , Thomas Haratyk , Scott McCaughie , Yehonathan Sharvit , Konrad Szydlo
4.3 (13)
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The Clojure Workshop

The Clojure Workshop

4.3 (13)
By: Joseph Fahey , Thomas Haratyk , Scott McCaughie , Yehonathan Sharvit , Konrad Szydlo

Overview of this book

The Clojure Workshop is a step-by-step guide to Clojure and ClojureScript, designed to quickly get you up and running as a confident, knowledgeable developer. Because of the functional nature of the language, Clojure programming is quite different to what many developers will have experienced. As hosted languages, Clojure and ClojureScript can also be daunting for newcomers because of complexities in the tooling and the challenge of interacting with the host platforms. To help you overcome these barriers, this book adopts a practical approach. Every chapter is centered around building something. As you progress through the book, you will progressively develop the 'muscle memory' that will make you a productive Clojure programmer, and help you see the world through the concepts of functional programming. You will also gain familiarity with common idioms and patterns, as well as exposure to some of the most widely used libraries. Unlike many Clojure books, this Workshop will include significant coverage of both Clojure and ClojureScript. This makes it useful no matter your goal or preferred platform, and provides a fresh perspective on the hosted nature of the language. By the end of this book, you'll have the knowledge, skills and confidence to creatively tackle your own ambitious projects with Clojure and ClojureScript.
Table of Contents (17 chapters)
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2
2. Data Types and Immutability

Lazy Trees

So far, we've seen that the "laziness" of lazy sequences is that they can point to future computations that will only be performed if they become necessary. There is another important advantage that is equally important, and that is what we are going to explore now. Remember from Chapter 6, Recursion and Looping, how recursive functions in Clojure need to use recur to avoid blowing up the stack? And remember how recur only works with a specific kind of recursion, tail recursion, where the next call to the recursive function can totally replace the previous call? The problem, you'll recall, is that only a limited number of stack frames are available. The function call on the root node of the tree needs to wait until all the calls have completed on all the child and grandchild and great-grandchild nodes, and so on. Stack frames are a limited resource but the data we need to operate on is often vast. This mismatch is a problem.

This is where lazy evaluation...

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The Clojure Workshop
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