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<h1 class="single">
  <span><a id="jumper" href="#jumpto" title="Un peu perdu ?">?</a></span>
  JavaScript et abstraction
  <time>Publié le 7 décembre 2015</time>
</h1>
<article class="single">
  <blockquote>
<p>However, Vanilla JS does not mean “use no abstractions”. Programming is all about abstractions! The Vanilla JS movement, is about favoring speed, smaller abstractions and understanding of the Web Platform, over big libraries that we treat as a black box. It’s about using libraries to save time, not to skip learning.</p>
<p><cite><em><a href="http://lea.verou.me/2015/12/introducing-bliss-a-3kb-library-for-happier-vanilla-js/">Introducing Bliss: A 3KB library for happier Vanilla JS</a></em> (<a href="/david/cache/5d5b6602ee225a8262987bded2b6ac2b/">cache</a>)</cite></p>
</blockquote>
<p>Je suis toujours confronté à la dure réalité d’une API difficile à prendre en main lorsque je présente JavaScript à <a href="/david/pro/enseignement/">des personnes n’ayant jamais pratiqué un langage de programmation</a>. D’un côté, il y a la chance de pouvoir avoir un <a href="/david/blog/2013/tdd-conception-emergente/">feedback visuel</a> immédiat lorsque l’on utilise la console du navigateur et en contrepartie on doit s’imposer des <code>querySelectorAll</code>, <code>addEventListener</code> et autres joyeusetés pour convertir une <code>NodeList</code> en <code>Array</code> qui sont incompréhensibles pour un débutant. Je me suis donc mis en quête d’une couche d’abstraction minimaliste pour <a href="https://github.com/davidbgk/comprendre-javascript">comprendre</a> JavaScript.</p>
<p>La plus intéressante que j’ai pu trouver est <a href="https://gist.github.com/paulirish/12fb951a8b893a454b32">bling.js par Paul Irish</a>, en une dizaine de lignes j’ai une bonne partie des raccourcis souhaités et les développeurs jQuery <a href="https://www.christianheilmann.com/2015/07/17/the-full-stackoverflow-developer/">Full Stack Overflow</a> (<a href="/david/cache/dd3b7b13443bac5d9fe0011426026429/">cache</a>) ne sont pas trop perdus. Les commentaires permettent d’arriver à une version améliorée qui ne touche pas au <code>prototype</code> et m’ont même fait découvrir <a href="https://github.com/dciccale/ki.js">ki.js</a> qui est à la limite de ce que je m’étais imposé en terme de taille de code. Et puis je découvre <a href="http://blissfuljs.com/">Bliss</a> et je commence à douter. <strong>La difficulté du choix d’une abstraction réside dans la perte de savoir-faire et de curiosité qu’elle entraine.</strong></p>
<p>J’arrive aux quelques lignes suivantes :</p>
<div class="codehilite"><pre><span class="cp">&lt;!doctype html&gt;</span>
<span class="nt">&lt;meta</span> <span class="na">charset=</span><span class="s">&quot;utf-8&quot;</span><span class="nt">&gt;</span>
<span class="nt">&lt;title&gt;</span>Test JavaScript<span class="nt">&lt;/title&gt;</span>
<span class="nt">&lt;style&gt;</span>
    <span class="nc">.turn-big</span> <span class="p">{</span>
        <span class="k">font-size</span><span class="o">:</span> <span class="m">5em</span><span class="p">;</span>
        <span class="n">transition</span><span class="o">:</span> <span class="k">font-size</span> <span class="m">2s</span><span class="p">;</span>
    <span class="p">}</span>
<span class="nt">&lt;/style&gt;</span>
<span class="nt">&lt;button&gt;</span>Click to turn big!<span class="nt">&lt;/button&gt;</span>
<span class="nt">&lt;script&gt;</span>
    <span class="c1">// Do not try to understand that… for now.</span>
    <span class="c1">// Inspired by https://gist.github.com/paulirish/12fb951a8b893a454b32</span>
    <span class="nb">window</span><span class="p">.</span><span class="nx">$</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">querySelectorAll</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="nb">document</span><span class="p">)</span>
    <span class="nx">Node</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">on</span> <span class="o">=</span> <span class="nb">window</span><span class="p">.</span><span class="nx">on</span> <span class="o">=</span> <span class="nx">Node</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">addEventListener</span>
    <span class="nx">NodeList</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">on</span> <span class="o">=</span> <span class="nx">NodeList</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">addEventListener</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">fn</span><span class="p">)</span> <span class="p">{</span>
         <span class="nb">Array</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">slice</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="k">this</span><span class="p">).</span><span class="nx">forEach</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">elem</span><span class="p">)</span> <span class="p">{</span>
             <span class="nx">elem</span><span class="p">.</span><span class="nx">addEventListener</span><span class="p">(</span><span class="nx">name</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="kc">false</span><span class="p">)</span>
         <span class="p">})</span>
    <span class="p">}</span>
    <span class="c1">// Reactivate your brain to understand the code below.</span>

    <span class="nx">$</span><span class="p">(</span><span class="s1">&#39;button&#39;</span><span class="p">).</span><span class="nx">on</span><span class="p">(</span><span class="s1">&#39;click&#39;</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">event</span><span class="p">.</span><span class="nx">target</span><span class="p">.</span><span class="nx">classList</span><span class="p">.</span><span class="nx">add</span><span class="p">(</span><span class="s1">&#39;turn-big&#39;</span><span class="p">)</span>
    <span class="p">})</span>
<span class="nt">&lt;/script&gt;</span>
</pre></div>


<p>C’est encore beaucoup pour un grand débutant mais au moins ça reste propre en termes d’API et d’interactions avec le HTML. Je suis ouvert à toute suggestion et retour d’expérience pour réduire les frictions lors d’un premier contact avec JavaScript.</p>
</article>


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    </p>

      <p>
        Les dernières publications hebdomadaires sont :
      </p>
      <ul class="with_columns">

          <li>
            <a href="/david/stream/2019/12/31/">Merci</a>
          </li>

          <li>
            <a href="/david/stream/2019/12/27/">Intemporels</a>
          </li>

          <li>
            <a href="/david/stream/2019/12/24/">Outils</a>
          </li>

          <li>
            <a href="/david/stream/2019/12/17/">Origines</a>
          </li>

          <li>
            <a href="/david/stream/2019/12/10/">Publier</a>
          </li>

          <li>
            <a href="/david/stream/2019/12/03/">En forêt</a>
          </li>

          <li>
            <a href="/david/stream/2019/11/26/">Ecocentric</a>
          </li>

          <li>
            <a href="/david/stream/2019/11/19/">Se livrer</a>
          </li>

          <li>
            <a href="/david/stream/2019/11/12/">Dépendances</a>
          </li>

          <li>
            <a href="/david/stream/2019/11/05/">Positif</a>
          </li>

          <li>
            <a href="/david/stream/2019/10/29/">Dettes</a>
          </li>

          <li>
            <a href="/david/stream/2019/10/22/">Privilèges</a>
          </li>

          <li>
            <a href="/david/stream/2019/10/15/">Discrétion</a>
          </li>

          <li>
            <a href="/david/stream/2019/10/08/">Désespérance</a>
          </li>

          <li>
            <a href="/david/stream/2019/10/01/">Présent</a>
          </li>

          <li>
            <a href="/david/stream/2019/09/24/">Manifester</a>
          </li>

          <li>
            <a href="/david/stream/2019/09/17/">Arpenter</a>
          </li>

          <li>
            <a href="/david/stream/2019/09/10/">Nostalgie</a>
          </li>

          <li>
            <a href="/david/stream/2019/09/03/">Déconstruire</a>
          </li>

          <li>
            <a href="/david/stream/2019/08/27/">Documenter</a>
          </li>

          <li>
            <a href="/david/stream/2019/08/20/">Frustration</a>
          </li>

          <li>
            <a href="/david/stream/2019/08/13/">Holisme</a>
          </li>

          <li>
            <a href="/david/stream/2019/08/06/">1%</a>
          </li>

          <li>
            <a href="/david/stream/2019/07/30/">Exemplarité</a>
          </li>

          <li>
            <a href="/david/stream/2019/07/23/">Timelines</a>
          </li>

          <li>
            <a href="/david/stream/2019/07/16/">Écoute</a>
          </li>

          <li>
            <a href="/david/stream/2019/07/02/">Anxiété</a>
          </li>

          <li>
            <a href="/david/stream/2019/06/21/">À lier</a>
          </li>

          <li>
            <a href="/david/stream/2019/06/14/">Pauvreté</a>
          </li>

          <li>
            <a href="/david/stream/2019/06/07/">Amateur</a>
          </li>

          <li>
            <a href="/david/stream/2019/05/31/">Pollution</a>
          </li>

          <li>
            <a href="/david/stream/2019/05/24/">Apaisement</a>
          </li>

          <li>
            <a href="/david/stream/2019/05/10/">Folie</a>
          </li>

          <li>
            <a href="/david/stream/2019/05/03/">Sympathie</a>
          </li>

          <li>
            <a href="/david/stream/2019/04/12/">Péremption</a>
          </li>

          <li>
            <a href="/david/stream/2019/04/05/">Définitions</a>
          </li>

          <li>
            <a href="/david/stream/2019/03/29/">Acceptation</a>
          </li>

          <li>
            <a href="/david/stream/2019/03/22/">Dissonance</a>
          </li>

          <li>
            <a href="/david/stream/2019/03/15/">Reconnaissance</a>
          </li>

          <li>
            <a href="/david/stream/2019/03/08/">Lecture</a>
          </li>

          <li>
            <a href="/david/stream/2019/03/01/">Journaux</a>
          </li>

          <li>
            <a href="/david/stream/2019/02/22/">Écriture</a>
          </li>

          <li>
            <a href="/david/stream/2019/02/15/">Kyriarchie</a>
          </li>

          <li>
            <a href="/david/stream/2019/02/08/">Mots-serrures</a>
          </li>

          <li>
            <a href="/david/stream/2019/02/01/">Sans voie</a>
          </li>

          <li>
            <a href="/david/stream/2019/01/25/">Auto-diagnostic</a>
          </li>

          <li>
            <a href="/david/stream/2019/01/18/">Agilité</a>
          </li>

          <li>
            <a href="/david/stream/2019/01/11/">Métaphores</a>
          </li>

          <li>
            <a href="/david/stream/2019/01/04/">Balbutiements</a>
          </li>

      </ul>

    <p>
      Voici quelques articles choisis :
      <a href="/david/blog/2019/faire-equipe/" title="Accéder à l’article complet">Faire équipe</a>,
      <a href="/david/blog/2018/bivouac-automnal/" title="Accéder à l’article complet">Bivouac automnal</a>,
      <a href="/david/blog/2018/commodite-effondrement/" title="Accéder à l’article complet">Commodité et effondrement</a>,
      <a href="/david/blog/2017/donnees-communs/" title="Accéder à l’article complet">Des données aux communs</a>,
      <a href="/david/blog/2016/accompagner-enfant/" title="Accéder à l’article complet">Accompagner un enfant</a>,
      <a href="/david/blog/2016/senior-developer/" title="Accéder à l’article complet">Senior developer</a>,
      <a href="/david/blog/2016/illusion-sociale/" title="Accéder à l’article complet">L’illusion sociale</a>,
      <a href="/david/blog/2016/instantane-scopyleft/" title="Accéder à l’article complet">Instantané Scopyleft</a>,
      <a href="/david/blog/2016/enseigner-web/" title="Accéder à l’article complet">Enseigner le Web</a>,
      <a href="/david/blog/2016/simplicite-defaut/" title="Accéder à l’article complet">Simplicité par défaut</a>,
      <a href="/david/blog/2016/minimalisme-esthetique/" title="Accéder à l’article complet">Minimalisme et esthétique</a>,
      <a href="/david/blog/2014/un-web-omni-present/" title="Accéder à l’article complet">Un web omni-présent</a>,
      <a href="/david/blog/2014/manifeste-developpeur/" title="Accéder à l’article complet">Manifeste de développeur</a>,
      <a href="/david/blog/2013/confort-convivialite/" title="Accéder à l’article complet">Confort et convivialité</a>,
      <a href="/david/blog/2013/testament-numerique/" title="Accéder à l’article complet">Testament numérique</a>,
      et <a href="/david/blog/" title="Accéder aux archives">bien d’autres…</a>
    </p>
    <p>
      On peut <a href="mailto:david%40larlet.fr" title="Envoyer un courriel">échanger par courriel</a>. Si éventuellement tu souhaites que l’on travaille ensemble, tu devrais commencer par consulter le <a href="http://larlet.com">profil dédié à mon activité professionnelle</a> et/ou contacter directement <a href="http://scopyleft.fr/">scopyleft</a>, la <abbr title="Société coopérative et participative">SCOP</abbr> dont je fais partie depuis six ans. Je recommande au préalable de lire <a href="/david/blog/2018/cout-site/" title="Attention ce qui va suivre peut vous choquer">combien coûte un site</a> et pourquoi je suis plutôt favorable à une <a href="/david/pro/devis/" title="Discutons-en !">non-demande de devis</a>.
    </p>
    <p>
      Je ne traque pas ta navigation mais mon
      <abbr title="Alwaysdata, 62 rue Tiquetonne 75002 Paris, +33.184162340">hébergeur</abbr>
      conserve des logs d’accès.
    </p>
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