scheme vs clojure

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Posted by Chris Eaves-Kohlbrenner e.g. There are significant differences, though, that might not be obvious at first. It is a “Data DSL”, where a map means “expect a map” and a vector means “expect a vector”. There is no real canonical implementation. It takes a procedure and argument values, so it’s entirely about semantics. ABOUT RACKET I have been using Racket (a dialect of Scheme) for several years to teach kids how to program. What programming language has the best syntax? Another bonus is that specs can be attached to functions and macros without modifying code using clojure.spec/fdef. The concurrency innovations are at best experimental, seem kitchen-sinky, and don't attract me much. Structure and Interpretation of Computer Programs, http://stackoverflow.com/q/6008313/2636454, http://gilesbowkett.blogspot.com/2015/01/one-major-difference-between-clojure.html, http://softwareengineering.stackexchange.com/q/153128/166211. Syntax is the technical term for the form of a program, what the program looks like. I’ll confess: when I first saw clojure.spec, I was neither impressed nor excited. There is no need to learn a new language like Prolog when the same ideas can easily be expressed with Scheme syntax. Scheme has SRFIs but are not universally acknowledged. Clojure is a general-purpose programming language written by Rich Hickey and released publicly in 2007. Not sure how much more you could ask for. Syntax Coloring; Snippets; support following snippets: cond, define, if, lambda, let, let1, set!. So it’s not just a simple recursive call, but a multi-way recursive call, which is the secret of dealing with deep lists. Scheme syntax is extremely regular and easy to pick up. This guy puts his finger on precisely the thing that might get me to switch from Common Lisp to Clojure someday. It’s used in many talks at Clojure conferences. And then sometimes people have written Clojure wrappers around Java frameworks. This book introduces fundamental ideas in computer science and covers an incredible amount of material quickly and clearly without requiring any prior knowledge. Clojure compiles to JVM bytecode and runs inside the JVM. My takeaway for this is this -- If the utility methods are not generic functions, it is fairly trivial to write a generic function that wraps around the utility method and then play with additional types as needed. As for eliminating self calls in tail position, that's a simpler problem which can be solved as long as the entire function body gets compiled to a single JVM method. One example is Incanter. That means that the schema looks similar to the data it specifies. Scheme teaches the important, fundamental ideas immediately without the distraction of unnecessary syntax or language features. And this article will cover a quick compare and contrast of both of these languages. Was this what the Clojure team was working on? What are the best server side programming languages? The sort of built-for-you way to do things (define-syntax with syntax-rules or syntax-case) is both hygienic and pattern-matching-based. Besides, recur is fairly well liked for its explicitness. Scheme metaprogramming also serves as a gentle introduction to domain specific languages. Scheme continues to evolve with a series of standards (Revised n Report on the Algorithmic Language Scheme) and a series of Scheme Requests for Implementation. Clojure does not attempt to maintain significant compatibility with other Lisps. Takeaway: The parsing feature is going to be really important. Are you referring to the author's example? Clojure syntax is simple, and users who are familiar with Lisp will likely find learning Clojure quite easy. Simplicity is one of the pillars on which Clojure is built. Compare this to Java, for example, where there are many different notations that are not uniform, so what you can put in one context is different than another context. Using macros to properly decompose a problem domain teaches new developers good habits, improving composibility and reliability when tackling large programs. It’s not that generative testing is hard, but the learning curve on spec is easier. Real TCO works for arbitrary calls in tail position, not just self calls, so that code like the following does not cause a : Clearly you'd need JVM support for this, since programs running on the JVM cannot manipulate the call stack. LISP-like languages are very different from mainstream languages (such as C/C++/Java/JavaScript/Python/you-name-it) - both in semantics and syntax. What are the best languages for backend in web development? It only has four procedures: The read-eval-print loop (REPL). True, and eff-you-forever Taligent for unleashing this stylistic horror on the world. That would be significant. It helps wiht automation, configuration and dependency management. How long does it take to become a full stack web developer? Here are the main points of similarity and differences: Schema focuses foremost on describing a data shape by using data in that shape. Leiningen is a very useful tool for Clojure developers. You can code Scala the same way as you code Java. Some of the sequence functions have no counterpart in Scheme/CL, and map to Haskell/ML … Clojure syntax is simple, and users who are familiar with Lisp will likely find learning Clojure quite easy. Care to expand on why you prefer Scala and how your experience with Java has led to that preference? IMPLEMENTATIONS: Scheme suffers from having so many implementations. Like-minded folks do not get the benefit of those wrappers. Thanks for your comment! And Quicklisp is a gift from god (Xach) --- a sort of repository of libraries for use. A formal specification of the syntax fits onto just a few pages; it can be introduced informally in a paragraph or two. We will discuss the differences based on various factors like speed and language complexity below. I was more baffled than anything. Schema seemed to solve the problem of describing the shape of the data, along with expected types at the leaves. They’ll be easier to make and have better error messages. I was trying to figure out what you mean from a Common Lisp perspective. These books are available for free online. It displays the game's code while you are playing and allows you to inject new code using Clojure. That was three years ago and Schema has since been used quite widely. I’ve been working through Structure and Interpretation of Computer Programs (SICP) and watching the UC Berkeley CS61A lectures from Brian Harvey. For example, (procedure arg arg arg) means “call that procedure with these argument values after you’ve recursively evaluated the argument expressions”. Now, out of the blue, the Clojure team announced clojure.spec. Syntax doesn’t get in the way. The quotation functionality of Lisp allow for extremely powerful, yet syntactically straightforward metaprogramming via macros. At the company I was working at, we had a few API endpoints and we were having the classic problem of having to write custom checkers for our data. What is the best programming language to learn first? Clearly Scheme and Clojure are both Lisps. We also experimented with the coercion facilities of Schema to convert data from the JSON endpoint into better Clojure equivalents. Many of the features of Lisp have made it into other languages, but Lisp’s approach to code-as-data and its macro system still set it apart. The keys function takes a list of required keywords which must be namespaced. Schema did have some useful operators for talking about heterogeneous vectors. While both clojure.spec and Schema allow namespaced and un-namespaced keywords, clojure.spec clearly encourages a global semantic for a unique keyword.

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