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Product details
File Size: 9887 KB
Print Length: 329 pages
Publisher: No Starch Press; 1 edition (October 15, 2015)
Publication Date: October 15, 2015
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B015P7F92G
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"Clojure for the Brave and True" is one of the best books, on any topic, to come out in the last 350 years.This book is intended for folks who have already dabbled in Ruby or Javascript or something, and are ready for the next level, which is, of course, Clojure!It is punchy, relevant, well-written, and mercifully unbombastic. It is earthy, but it is lofty too. It is totally incomplete, thank goodness; you won't use it as a reference. But it should be good for "cracking the nut". The examples are brisk and plentiful, and except for the odd turn-of-a-page, they never exceed your field of vision (which is a great strength of Clojure).Some may think "for the brave and true" is just whimsy, but I believe the publisher's lawyers insisted on it. This book is not for dummies. Your curiosity, your high standards, and your impatience to start attacking real projects will be rewarded. The book frequently tosses out train-of-thought insights, invaluable clues to a "Clojure way" of making work easy.In the same vein as recommending chopsticks for Chinese food, the chapter about Emacs gets you into live REPL coding using traditional Lisp power tools for "structural editing" (time- and sanity-saving acrobatics with parentheses). But you can skip Emacs if you want; the rest of the book does not depend on it.The zany, off-hand tone sags toward the end, as though the author had had to be tranquilized before the book was finished and his step-mother took over. But this does not detract materially. She was almost as brave, and almost as true, just less flamboyant."Clojure for the Brave and True" gives you the lay of the land, with no claim of completeness. That is as it should be. It is strong on the principles, so you might continue learning in any way you want. A good next book would be Emerick, Carper & Grand's "Clojure Programming", which is even more meticulously principled, also very well written, and useful not only to finish coming up to speed but also as a reference work.
update: 2016-01-04: just finished chapter 6 "Organizing Your Project: A Librarian’s Tale". So far so good (fyi, I'm not working through this full time, so don't read too much into the tempo of my updates). Had some fiddle with the svg to get it to render on my ubuntu vm, but it got there. The most surprising thing was the use of -> and ->> (Thread First & Thread Last macros, respectively), which I had to do a little digging on to understand as I didn't see where it was covered in the text... I would have preferred to see the example code done "long-form way". But so far so good, I'm enjoying the read.Chapter 5 "Functional Programming" was both enjoyable and helpful, and the game example was pleasantly educational. I ended up manually keying large parts of the game function, just to get practice debugging and executing each bit and coding some unit tests to help me understand what it does. I also found the "assert" function on my own and coded up some tests in my clj file (not covered in the book, but figured I'd mention that here for anyone who is a fan of test driven development to consider): example...(defn row-num "Returns row number the position belongs to: row : positions 1 : 1 2 : 2 3 3 : 4 5 7" [pos] (inc (count (take-while #(> pos %) tri)))); tests... ; row# : positions...(assert (= 1 (row-num 1))) ; 1 : 1(assert (= 3 (row-num 5))) ; 2 : 2 3(assert (= 4 (row-num 10))) ; 3 : 4 5 6(assert (= 5 (row-num 15))) ; 4 : 7 8 9 10(assert (= 6 (row-num 16))) ; 5 : 11 12 13 14 15; tests on pos#'s 10, 15 & 16 ; 6 : 16 17 18 19 20 21; are intended to catch boundary conditions (spans rows 4, 5 & 6).(println "TESTS OK: row-num")I also ended up weaving "println"s and "let"s into the various functions to help me understand what they do. Makes the functions much more verbose, but helpful for my head to "see" what is going on in the inside.example:(defn connect "Form a mutual connection between two positions" [ board max-pos pos neighbor destination ] (do (if trace (println "\n---- connect: max-pos=" max-pos ", pos=" pos ", neighbor=" neighbor ", destination=" destination)) (if (<= destination max-pos) (let [ result (reduce (fn [new-board [p1 p2]] (do (if trace (do (println "reduce.new-board" new-board) (println "reduce.p1" p1) (println "reduce.p2" p2))) (assoc-in new-board [p1 :connections p2] neighbor))) board (do (if trace (do (println "reduce.new-board" new-board) (println "reduce.p1" p1) (println "reduce.p2" p2))) (assoc-in new-board [p1 :connections p2] neighbor))) board )] (if trace (println "\nresult=" result)) result) board)))( let [ c (connect {} 15 1 2 4)]; expected: {1 {:connections {4 2}, 4 {:connections {1 2}} (assert (= 2 (count c))) ; top level keys, 1 & 4. (assert (contains? c 1)) (assert (contains? (get c 1) :connections)) (assert (contains? (get (get c 1) :connections) 4)) (assert (= 2 (get (get (get c 1) :connections) 4))) (assert (contains? c 4)) (assert (contains? (get c 4) :connections)) (assert (contains? (get (get c 4) :connections) 1)) (assert (= 2 (get (get (get c 4) :connections) 1))) (println "TESTS OK: connects"))Chapters 4 "Core Functions in Depth" was interesting, I will be re-reading this again after the sequences and lazy evaluation has some time to sink in... this feels like it will be a big (albeit productive) change in my programmer's world-view. I especially enjoyed the smaller examples, they were thought provoking. For example: "If you want an exercise that will really blow your hair back, try implementing map using reduce, and then do the same for filter and some after you read about them later in this chapter."Chapter 3 "Do Things: A Clojure Crash Course" had a good temp; the 'hobbit violence' example actually helped me think through more traditional data structures and "clojure style".update: 2015-11-27: after driving emacs for a while, it reminds me of a much smarter notepad, while I miss the "surgical precision" that I can navigate with in vi, I can see making emacs my clojure ide.Love it! Life-long vi user here making the transition to emacs as part of the Clojure learning curve, and I found the online "Chapter 2 How to Use Emacs, an Excellent Clojure Editor". I bought the paperback version just now because Chapter 2 is simply That Awesome.Thank you, good sir, for making what looked like a steep learning curve seem very manageable.My favorite quote thus far:"Emacs was invented in, like, 1802 or something, so it uses terminology slightly different from what you’re used to. What you would normally refer to as a window, Emacs calls a frame..."I'm just not used to laughing that hard when reading technical books :-)Seriously, the author has put a LOT of energy and thought into how to boil down, package and guide the reader through a complex landscape and I'm impressed with how artfully they do it. I will update when I reach the end.
This is one of my favorite computer books. I read it cover to cover. It's a great introduction Lisp and Clojure. Someone with limited programming experience could pick up this book and get an understanding of functional programming. The examples scenarios involve super heros and vampires, which might seem odd at times, but that's what makes it fun, as opposed to a dry HTTP request pressing example. I'll tell you, some of the other Clojure books are quite boring to read. The original artwork in Brave and True is enjoyable.Chapter 7, on macros and the Clojure reader/evaluator, WOW! This is where you get your mind blown when you understand how you can use code to generate code. This is something you'll never have seen if you come from Ruby, Python, JavaScript world. There are a bunch of diagrams that explain how the Clojure reader and evaluator works. I would recommend "Mastering Clojure Macros" book for in depth study of macros.I would recommend skipping the chapter on emacs if you're not a regular emacs user. Leaning Clojure and emacs at the same time is too much effort. Use your favorite editor then join the church of emacs later.Get this book if you're learning Clojure.
Well written, funny and loaded with useful Clojure content. The whole contents of the book are on Daniel's website. I read enough online to decide that I liked his style and wanted a hard-copy of the book. I'm glad I did.
Great book for learning Clojure. I looked at, and have a read a few others, but this is my favorite intro book.
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