index.html

---
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>
            <img class="bench" src="/assets/img/landing/woo.png" />
            <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>
                <div class="device-wrapper">
                    <div class="device-mockup macbook">
                        <div class="device">
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                                </a>
                            </div>
                        </div>
                    </div>
                </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">
                                <a href="{{ reference.link }}">
                                    {{ reference.quote.source }}
                                </a>
                            </div>
                        </blockquote>
                        {% endif %}
                    </div>
                </div>
            </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>
</main>
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