Merge pull request #53 from fiji-flo/unslugging-es

Unslugging es

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+---
+title: String.prototype.codePointAt()
+slug: Web/JavaScript/Reference/Global_Objects/String/codePointAt
+translation_of: Web/JavaScript/Reference/Global_Objects/String/codePointAt
+original_slug: Web/JavaScript/Referencia/Objetos_globales/String/codePointAt
+---
+<div>{{JSRef}}</div>
+
+<div> </div>
+
+<div>El método <strong><code>codePointAt() </code></strong><code>d</code>evuelve un entero no negativo que equivale al valor Unicode code point del carácter.</div>
+
+<h2 id="Sintaxis">Sintaxis</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.codePointAt(<var>indice</var>)</code></pre>
+
+<h3 id="Parámetros">Parámetros</h3>
+
+<dl>
+ <dt><code>indice</code></dt>
+ <dd>Índice del carácter en la cadena del que se quiere obtener el valor del Unicode code point.</dd>
+</dl>
+
+<h3 id="Valor_de_retorno">Valor de retorno</h3>
+
+<p>Un número que equivale al valor code point del carácter especificado en el índice de la cadena; devuelve {{jsxref("undefined")}} si no se encuentra carácter en la posición especifica.</p>
+
+<h2 id="Description">Description</h2>
+
+<p>If there is no element at the specified position, {{jsxref("undefined")}} is returned. If no UTF-16 surrogate pair begins at <code>pos</code>, the code unit at <code>pos</code> is returned.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_codePointAt()">Using <code>codePointAt()</code></h3>
+
+<pre class="brush: js">'ABC'.codePointAt(1);          // 66
+'\uD800\uDC00'.codePointAt(0); // 65536
+
+'XYZ'.codePointAt(42); // undefined
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>The following extends Strings to include the <code>codePointAt()</code> function as specified in ECMAScript 2015 for browsers not supporting it natively.</p>
+
+<pre class="brush: js">/*! http://mths.be/codepointat v0.1.0 by @mathias */
+if (!String.prototype.codePointAt) {
+  (function() {
+    'use strict'; // needed to support `apply`/`call` with `undefined`/`null`
+    var codePointAt = function(position) {
+      if (this == null) {
+        throw TypeError();
+      }
+      var string = String(this);
+      var size = string.length;
+      // `ToInteger`
+      var index = position ? Number(position) : 0;
+      if (index != index) { // better `isNaN`
+        index = 0;
+      }
+      // Account for out-of-bounds indices:
+      if (index &lt; 0 || index &gt;= size) {
+        return undefined;
+      }
+      // Get the first code unit
+      var first = string.charCodeAt(index);
+      var second;
+      if ( // check if it’s the start of a surrogate pair
+        first &gt;= 0xD800 &amp;&amp; first &lt;= 0xDBFF &amp;&amp; // high surrogate
+        size &gt; index + 1 // there is a next code unit
+      ) {
+        second = string.charCodeAt(index + 1);
+        if (second &gt;= 0xDC00 &amp;&amp; second &lt;= 0xDFFF) { // low surrogate
+          // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+          return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
+        }
+      }
+      return first;
+    };
+    if (Object.defineProperty) {
+      Object.defineProperty(String.prototype, 'codePointAt', {
+        'value': codePointAt,
+        'configurable': true,
+        'writable': true
+      });
+    } else {
+      String.prototype.codePointAt = codePointAt;
+    }
+  }());
+}
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2015', '#sec-string.prototype.codepointat', 'String.prototype.codePointAt')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.codepointat', 'String.prototype.codePointAt')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.String.codePointAt")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("String.fromCodePoint()")}}</li>
+ <li>{{jsxref("String.fromCharCode()")}}</li>
+ <li>{{jsxref("String.prototype.charCodeAt()")}}</li>
+ <li>{{jsxref("String.prototype.charAt()")}}</li>
+</ul>