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---
layout: default
css_file: landing
description: Common Lisp
---

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<main class="landing">
  {% include big-header.html text='Common Lisp' url='/assets/img/header/landing.jpg' %}
  <section class="features">
    <section class="extensible">
      <h2>Extensible from the Inside-Out</h2>
      <div class="row">
        <div class="desc">
          <blockquote>
            <p>
              Part of what makes Lisp distinctive is that it is designed to
              evolve. As new abstractions become popular (object-oriented
              programming, for example), it always turns out to be easy to
              implement them in Lisp. Like DNA, such a language does not go out
              of style.
            </p>

            <div class="source">
              Paul Graham, <a href="/books/#ansi-common-lisp">ANSI Common Lisp</a>
            </div>
          </blockquote>
        </div>
        <div class="sample">
          <p>
            An example of <a href="https://github.com/fukamachi/sxql">SxQL</a>, a macro-based SQL DSL
          </p>
          <div class="window">
            <div class="titlebar">
              <div></div>
              <div></div>
              <div></div>
            </div>
            <div class="body">
              <pre><code class="lisp">(select (:title :author :year)
  (from :books)
  (where (:and (:>= :year 1995)
               (:< :year 2010)))
  (order-by (:desc :year)))

⇒ ((:title "Practical Common Lisp"
    :author "Peter Seibel"
    :year 2005)
   (:title "ANSI Common Lisp"
    :author "Paul Graham"
    :year 1995))</code></pre>
            </div>
          </div>
        </div>
      </div>
    </section>
    <section class="stable">
      <div class="text">
        <h2>Mature &amp; Stable</h2>
        <p>
          An extensive <a href="/spec/">standard</a> provides a rock-solid
          foundation that you can confidently build upon. You won't be
          reinventing the same old wheels ten years from now.
        </p>
      </div>
    </section>
    <section class="paradigm">
      <section class="box fp">
        <h2>Functional</h2>
        <div class="desc">
          Functions are first class objects: you can pass them around, store
          them, call them dynamically. Build your application by composing
          small, functional building blocks.
        </div>
        <pre><code class="lisp">(reduce #'-
        (reverse (list 1 2 3)))
⇒ 0

(mapcar #'string-downcase
        (list "Hello" "world!"))
=> ("hello" "world!")</code></pre>
      </section>
      <section class="box oop">
        <h2>Object-Oriented</h2>
        <div class="desc">
          Build reusable and extensible class hierarchies using the Common Lisp
          Object System. Design patterns
          <a href="http://norvig.com/design-patterns/design-patterns.pdf">disappear</a>
          as you adapt the language to your problem domain.
        </div>
        <pre><code class="lisp">(defclass book ()
  ((title :reader book-title
          :initarg :title)
   (author :reader book-author
           :initarg :author))
  (:documentation "Describes a book."))

(make-instance 'book
               :title "ANSI Common Lisp"
               :author "Paul Graham")</code></pre>
      </section>
    </section>
    <section class="fast">
      <h2>Fast</h2>
      <div id="perfchart" class="ct-chart ct-perfect-fourth"></div>
      <div class="desc">
        Requests per second using <a href="https://github.com/fukamachi/woo">Woo</a>, an HTTP server written in pure Common Lisp.
      </div>
    </section>
    <section class="tools">
      <div class="row">
        <div class="desc">
          <h2>Great Tools</h2>
          <div class="text">
            <p>
              <a href="https://common-lisp.net/project/slime/">SLIME</a>, an IDE that leverages the power of Common
              Lisp and the extensibility of Emacs, provides a development
              environment ahead of anything else.
            </p>
            <p>
              You can leave the write-compile-debug cycle behind. Everything is
              interactive: try your code on the REPL as you write it, and a
              powerful debugger lets you inspect trees of live values, or rewind
              the stack to undo an exception.
            </p>
          </div>
        </div>
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        </div>
      </div>
    </section>
  </section>
  <section class="testimonials">
    <ul>
      {% for reference in site.data.testimonials %}
        <li>
          <div class="logo">
            <img alt="{{ reference.company.name }}"
                 title="{{ reference.company.name }}"
                 src="/assets/img/companies/{{ reference.company.logo }}">
          </div>
          <div class="text-wrapper">
            <div class="text">
              {% if reference.description %}
                {{ reference.description | markdownify }}
              {% endif %}
              {% if reference.quote %}
                <blockquote>
                  {{ reference.quote.text | markdownify }}
                  <div class="source">
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                      {{ reference.quote.source }}
                    </a>
                  </div>
                </blockquote>
              {% endif %}
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        </li>
      {% endfor %}
    </ul>
    <div class="text">
      See more <a href="/success/">success stories</a>
    </div>
  </section>
  <section class="start">
    <a href="/learn/">Start here</a>
  </section>
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