The first line tells your POSIX terminal what executable to use to run the script. (setf *random-state* (make-random-state t)) (pprint (random (parse-integer (nth 0 num)))) If you're familiar with Python's IDLE, Lisp's REPL should feel somewhat familiar to you. You can run this expression and others in an interactive Common Lisp environment called REPL (read-eval-print loop). It's also a Lisp expression, using a symbol ( +) that evaluates to a function (addition) and two arguments ( 1 and 2). For instance, this is a list of an operator ( +) and two integers ( 1 and 2): (+ 1 2) The basic unit of Lisp source code is an expression, which is written as a list. Should you choose to use a different Lisp implementation, the command to run Lisp code is different from what I use in this article ( gcl or sbcl instead of clisp, for example) but everything else is the same. On Fedora Linux: $ sudo dnf install clispįor macOS, you can use MacPorts or Homebrew: $ sudo port install clispįor Windows, you can either use clisp on Cygwin or download a GCL binary from gnu.org/software/gcl.Įven though I'm using the clisp command, most of the principles in this article apply to any Lisp. You can install any of these with your distribution's package manager, but for this article I use clisp. Popular open source versions include SBCL, GNU Lisp, and GNU Common Lisp (GCL). You might be surprised how much Lisp code there is lurking within big codebases in any given industry, so it's a good idea to have at least a passing familiarity with the language. Whether you love or hate its design philosophies, Lisp is an interesting glimpse at the past and, thanks to Clojure and Guile, into the future. People who love thinking about the aesthetics of programming languages often hate Lisp because of its frequent use of parentheses for scoping in fact, it's a common joke that Lisp stands for Lots of Irritating Superfluous Parentheses. People who love thinking about the design of programming languages often love Lisp because of how its syntax and data share the same structure: Lisp code is essentially a list of lists, and its name is an acronym for LISt Processing. eBook: An introduction to programming with Bash.Try for free: Red Hat Learning Subscription.
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