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+---
+title: constructor
+slug: Web/JavaScript/Referencia/Classes/constructor
+translation_of: Web/JavaScript/Reference/Classes/constructor
+---
+<div>{{jsSidebar("Classes")}}</div>
+
+<h2 id="Resum">Resum</h2>
+
+<p>El mètode <code>constructor</code> és un mètode especial per crear i inicialitzar un objecte creat amb una <code>class</code>.</p>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox">constructor([arguments]) { ... }</pre>
+
+<h2 id="Descripció">Descripció</h2>
+
+<p>Només hi pot haver un mètode especial am el nom "constructor" en una classe. Es llançarà un {{jsxref("SyntaxError")}}, si la classe conté més d'un cas d'un mètode <code>constructor</code>.</p>
+
+<p>Un constructor pot utilitzar la paraula clau <code>super</code> per cridar el constructor de la classe pare.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<p>Aquest fragment de codi es pren de <a href="https://github.com/GoogleChrome/samples/blob/gh-pages/classes-es6/index.html">mostra de classes</a> (<a href="https://googlechrome.github.io/samples/classes-es6/index.html">demostració en viu</a>).</p>
+
+<pre class="brush: js">class Square extends Polygon {
+  constructor(length) {
+    // Aquí es crida el constructor del pare de la classe amb les longituts
+    // proveïdes per l'amplada i l'alçada del polígon
+    super(length, length);
+    // Nota: En classes derivades, s'ha de cridar super() abans
+    // d'utilitzar 'this'. Obviar això causarà un error de referència.
+    this.name = 'Square';
+  }
+
+  get area() {
+    return this.height * this.width;
+  }
+
+  set area(value) {
+    this.area = value;
+  }
+}</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentaris</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-static-semantics-constructormethod', 'Constructor Method')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Definició inicial.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatChrome(42.0)}}</td>
+   <td>
+    <p>Disponible només al canal Nightly  (desde febrer del 2015)</p>
+   </td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Android</th>
+   <th>Chrome per Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(42.0)}}</td>
+   <td>Disponible només al canal Nightly  (desde febrer del 2015)</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h3 id="Notes_específiques_per_Firefox">Notes específiques per Firefox</h3>
+
+<ul>
+ <li>Els constructors estàndards encara no s'han implementat ({{bug(1105463)}})</li>
+</ul>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/super">super()</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/class">expressió </a><a href="/en-US/docs/Web/JavaScript/Reference/Operators/class"><code>class</code> </a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/class">declaració </a><a href="/en-US/docs/Web/JavaScript/Reference/Statements/class"><code>class</code> </a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Classes">Classes</a></li>
+</ul>
diff --git a/files/ca/web/javascript/referencia/classes/index.html b/files/ca/web/javascript/referencia/classes/index.html
new file mode 100644
index 0000000000..23daf7e1ff
--- /dev/null
+++ b/files/ca/web/javascript/referencia/classes/index.html
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+---
+title: Classes
+slug: Web/JavaScript/Referencia/Classes
+tags:
+  - Classes
+  - ECMAScript 2015
+  - Experimental
+  - Expérimental(2)
+  - JavaScript
+  - NeedsContent
+  - NeedsTranslation
+  - Reference
+  - Référence(2)
+  - TopicStub
+translation_of: Web/JavaScript/Reference/Classes
+---
+<div>{{JsSidebar("Classes")}}</div>
+
+<p>JavaScript classes, introduced in ECMAScript 2015, are primarily syntactical sugar over JavaScript's existing prototype-based inheritance. The class syntax <strong>does not</strong> introduce a new object-oriented inheritance model to JavaScript.</p>
+
+<h2 id="Defining_classes">Defining classes</h2>
+
+<p>Classes are in fact "special <a href="/en-US/docs/Web/JavaScript/Reference/Functions">functions</a>", and just as you can define <a href="/en-US/docs/Web/JavaScript/Reference/Operators/function">function expressions</a> and <a href="/en-US/docs/Web/JavaScript/Reference/Statements/function">function declarations</a>, the class syntax has two components: <a href="/en-US/docs/Web/JavaScript/Reference/Operators/class">class expressions</a> and <a href="/en-US/docs/Web/JavaScript/Reference/Statements/class">class declarations</a>.</p>
+
+<h3 id="Class_declarations">Class declarations</h3>
+
+<p>One way to define a class is using a <strong>class declaration</strong>. To declare a class, you use the <code>class</code> keyword with the name of the class ("Rectangle" here).</p>
+
+<pre class="brush: js">class Rectangle {
+  constructor(height, width) {
+    this.height = height;
+    this.width = width;
+  }
+}</pre>
+
+<h4 id="Hoisting">Hoisting</h4>
+
+<p>An important difference between <strong>function declarations</strong> and <strong>class declarations</strong> is that function declarations are {{Glossary("Hoisting", "hoisted")}} and class declarations are not. You first need to declare your class and then access it, otherwise code like the following will throw a {{jsxref("ReferenceError")}}:</p>
+
+<pre class="brush: js example-bad">var p = new Rectangle(); // ReferenceError
+
+class Rectangle {}
+</pre>
+
+<h3 id="Class_expressions">Class expressions</h3>
+
+<p>A <strong>class expression</strong> is another way to define a class. Class expressions can be named or unnamed. The name given to a named class expression is local to the class's body. (it can be retrieved through the class's (not an instance's) <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name">.name</a> property, though)</p>
+
+<pre class="brush: js">// unnamed
+var Rectangle = class {
+  constructor(height, width) {
+    this.height = height;
+    this.width = width;
+  }
+};
+console.log(Rectangle.name);
+// output: "Rectangle"
+
+// named
+var Rectangle = class Rectangle2 {
+  constructor(height, width) {
+    this.height = height;
+    this.width = width;
+  }
+};
+console.log(Rectangle.name);
+// output: "Rectangle2"
+</pre>
+
+<p><strong>Note:</strong> Class <strong>expressions</strong> also suffer from the same hoisting issues mentioned for Class <strong>declarations</strong>.</p>
+
+<h2 id="Class_body_and_method_definitions">Class body and method definitions</h2>
+
+<p>The body of a class is the part that is in curly brackets <code>{}</code>. This is where you define class members, such as methods or constructor.</p>
+
+<h3 id="Strict_mode">Strict mode</h3>
+
+<p>The bodies of <em>class declarations</em> and <em>class expressions</em> are executed in <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode">strict mode</a> i.e. constructor, static and prototype methods, getter and setter functions are executed in strict mode.</p>
+
+<h3 id="Constructor">Constructor</h3>
+
+<p>The <code><a href="/en-US/docs/Web/JavaScript/Reference/Classes/constructor">constructor</a></code> method is a special method for creating and initializing an object created with a <code>class</code>. There can only be one special method with the name "constructor" in a class. A {{jsxref("SyntaxError")}} will be thrown if the class contains more than one occurrence of a <code>constructor</code> method.</p>
+
+<p>A constructor can use the <code>super</code> keyword to call the constructor of the super class.</p>
+
+<h3 id="Prototype_methods">Prototype methods</h3>
+
+<p>See also <a href="/en-US/docs/Web/JavaScript/Reference/Functions/Method_definitions">method definitions</a>.</p>
+
+<pre class="brush: js">class Rectangle {
+  constructor(height, width) {
+    this.height = height;
+    this.width = width;
+  }
+  // Getter
+  get area() {
+    return this.calcArea();
+  }
+  // Method
+  calcArea() {
+    return this.height * this.width;
+  }
+}
+
+const square = new Rectangle(10, 10);
+
+console.log(square.area); // 100</pre>
+
+<h3 id="Static_methods">Static methods</h3>
+
+<p>The <code><a href="/en-US/docs/Web/JavaScript/Reference/Classes/static">static</a></code> keyword defines a static method for a class. Static methods are called without <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript#The_object_(class_instance)" title='An example of class instance is "var john = new Person();"'>instantiating </a>their class and <strong>cannot </strong>be called through a class instance. Static methods are often used to create utility functions for an application.</p>
+
+<pre class="brush: js">class Point {
+  constructor(x, y) {
+    this.x = x;
+    this.y = y;
+  }
+
+  static distance(a, b) {
+    const dx = a.x - b.x;
+    const dy = a.y - b.y;
+
+    return Math.hypot(dx, dy);
+  }
+}
+
+const p1 = new Point(5, 5);
+const p2 = new Point(10, 10);
+
+console.log(Point.distance(p1, p2)); // 7.0710678118654755</pre>
+
+<h3 id="Boxing_with_prototype_and_static_methods">Boxing with prototype and static methods</h3>
+
+<p>When a static or prototype method is called without a value for <em>this</em>, the <em>this</em> value will be <font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.498039);">undefined</span></font> inside the method. This behavior will be the same even if the <code>"use strict"</code> directive isn't present, because code within the <code>class</code> syntax is always executed in strict mode.</p>
+
+<pre class="brush: js">class Animal {
+  speak() {
+    return this;
+  }
+  static eat() {
+    return this;
+  }
+}
+
+let obj = new Animal();
+obj.speak(); // Animal {}
+let speak = obj.speak;
+speak(); // undefined
+
+Animal.eat() // class Animal
+let eat = Animal.eat;
+eat(); // undefined</pre>
+
+<p>If the above is written using traditional function–based syntax, then autoboxing in method calls will happen in non–strict mode based on the initial <em>this</em> value. If the inital value is <code>undefined</code>, <em>this</em> will be set to the global object.</p>
+
+<p>Autoboxing will not happen in strict mode, the <em>this</em> value remains as passed.</p>
+
+<pre class="brush: js">function Animal() { }
+
+Animal.prototype.speak = function() {
+  return this;
+}
+
+Animal.eat = function() {
+  return this;
+}
+
+let obj = new Animal();
+let speak = obj.speak;
+speak(); // global object
+
+let eat = Animal.eat;
+eat(); // global object
+</pre>
+
+<h3 id="Instance_properties">Instance properties</h3>
+
+<p>Instance properties must be defined inside of class methods:</p>
+
+<pre class="brush: js">class Rectangle {
+  constructor(height, width) {
+    this.height = height;
+    this.width = width;
+  }
+}</pre>
+
+<p>Static class-side properties and prototype data properties must be defined outside of the ClassBody declaration:</p>
+
+<pre class="brush: js">Rectangle.staticWidth = 20;
+Rectangle.prototype.prototypeWidth = 25;
+</pre>
+
+<p> </p>
+
+<h2 id="Sub_classing_with_extends">Sub classing with <code>extends</code></h2>
+
+<p>The <code><a href="/en-US/docs/Web/JavaScript/Reference/Classes/extends">extends</a></code> keyword is used in <em>class declarations</em> or <em>class expressions</em> to create a class as a child of another class.</p>
+
+<pre class="brush: js">class Animal {
+  constructor(name) {
+    this.name = name;
+  }
+
+  speak() {
+    console.log(this.name + ' makes a noise.');
+  }
+}
+
+class Dog extends Animal {
+  speak() {
+    console.log(this.name + ' barks.');
+  }
+}
+
+var d = new Dog('Mitzie');
+d.speak(); // Mitzie barks.
+</pre>
+
+<p>If there is a constructor present in subclass, it needs to first call super() before using "this".</p>
+
+<p>One may also extend traditional function-based "classes":</p>
+
+<pre class="brush: js">function Animal (name) {
+  this.name = name;
+}
+
+Animal.prototype.speak = function () {
+  console.log(this.name + ' makes a noise.');
+}
+
+class Dog extends Animal {
+  speak() {
+    console.log(this.name + ' barks.');
+  }
+}
+
+var d = new Dog('Mitzie');
+d.speak(); // Mitzie barks.
+</pre>
+
+<p>Note that classes cannot extend regular (non-constructible) objects. If you want to inherit from a regular object, you can instead use {{jsxref("Object.setPrototypeOf()")}}:</p>
+
+<pre class="brush: js">var Animal = {
+  speak() {
+    console.log(this.name + ' makes a noise.');
+  }
+};
+
+class Dog {
+  constructor(name) {
+    this.name = name;
+  }
+}
+
+// If you do not do this you will get a TypeError when you invoke speak
+Object.setPrototypeOf(Dog.prototype, Animal);
+
+var d = new Dog('Mitzie');
+d.speak(); // Mitzie makes a noise.
+</pre>
+
+<h2 id="Species">Species</h2>
+
+<p>You might want to return {{jsxref("Array")}} objects in your derived array class <code>MyArray</code>. The species pattern lets you override default constructors.</p>
+
+<p>For example, when using methods such as {{jsxref("Array.map", "map()")}} that returns the default constructor, you want these methods to return a parent <code>Array</code> object, instead of the <code>MyArray</code> object. The {{jsxref("Symbol.species")}} symbol lets you do this:</p>
+
+<pre class="brush: js">class MyArray extends Array {
+  // Overwrite species to the parent Array constructor
+  static get [Symbol.species]() { return Array; }
+}
+
+var a = new MyArray(1,2,3);
+var mapped = a.map(x =&gt; x * x);
+
+console.log(mapped instanceof MyArray); // false
+console.log(mapped instanceof Array);   // true
+</pre>
+
+<h2 id="Super_class_calls_with_super">Super class calls with <code>super</code></h2>
+
+<p>The <code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/super">super</a></code> keyword is used to call corresponding methods of super class.</p>
+
+<pre class="brush: js">class Cat {
+  constructor(name) {
+    this.name = name;
+  }
+
+  speak() {
+    console.log(this.name + ' makes a noise.');
+  }
+}
+
+class Lion extends Cat {
+  speak() {
+    super.speak();
+    console.log(this.name + ' roars.');
+  }
+}
+
+var l = new Lion('Fuzzy');
+l.speak();
+// Fuzzy makes a noise.
+// Fuzzy roars.
+
+</pre>
+
+<h2 id="Mix-ins">Mix-ins</h2>
+
+<p>Abstract subclasses or <em>mix-ins</em> are templates for classes. An ECMAScript class can only have a single superclass, so multiple inheritance from tooling classes, for example, is not possible. The functionality must be provided by the superclass.</p>
+
+<p>A function with a superclass as input and a subclass extending that superclass as output can be used to implement mix-ins in ECMAScript:</p>
+
+<pre class="brush: js">var calculatorMixin = Base =&gt; class extends Base {
+  calc() { }
+};
+
+var randomizerMixin = Base =&gt; class extends Base {
+  randomize() { }
+};
+</pre>
+
+<p>A class that uses these mix-ins can then be written like this:</p>
+
+<pre class="brush: js">class Foo { }
+class Bar extends calculatorMixin(randomizerMixin(Foo)) { }</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-class-definitions', 'Class definitions')}}</td>
+   <td>{{Spec2('ES2015')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2016', '#sec-class-definitions', 'Class definitions')}}</td>
+   <td>{{Spec2('ES2016')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES2017', '#sec-class-definitions', 'Class definitions')}}</td>
+   <td>{{Spec2('ES2017')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-class-definitions', 'Class definitions')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("javascript.classes")}}</p>
+
+<h2 id="Running_in_Scratchpad">Running in Scratchpad</h2>
+
+<p>A class can't be redefined. If you're playing with code in Scratchpad (Firefox menu Tools &gt; Web Developer &gt; Scratchpad) and you 'Run' a definition of a class with the same name twice, you'll get a confusing SyntaxError: redeclaration of let &lt;class-name&gt;.</p>
+
+<p>To re-run a definition, use Scratchpad's menu Execute &gt; Reload and Run.<br>
+ Please vote for bug <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1428672">#1428672</a>.</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Functions">Functions</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/class"><code>class</code> declaration</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/class"><code>class</code> expression</a></li>
+ <li>{{jsxref("Operators/super", "super")}}</li>
+ <li><a href="https://hacks.mozilla.org/2015/07/es6-in-depth-classes/">Blog post: "ES6 In Depth: Classes"</a></li>
+ <li><a href="https://github.com/tc39/proposal-class-fields">Fields and public/private class properties proposal (stage 3)</a></li>
+</ul>
diff --git a/files/ca/web/javascript/referencia/classes/static/index.html b/files/ca/web/javascript/referencia/classes/static/index.html
new file mode 100644
index 0000000000..3255dc1552
--- /dev/null
+++ b/files/ca/web/javascript/referencia/classes/static/index.html
@@ -0,0 +1,116 @@
+---
+title: static
+slug: Web/JavaScript/Referencia/Classes/static
+translation_of: Web/JavaScript/Reference/Classes/static
+---
+<div>{{jsSidebar("Classes")}}</div>
+
+<p>La paraula clau <strong>static</strong> defineix un mètode estàtic per a una classe.</p>
+
+<h2 id="Sintaxi">Sintaxi</h2>
+
+<pre class="syntaxbox">static methodName() { ... }</pre>
+
+<h2 id="Descripció">Descripció</h2>
+
+<p><u>Els mètodes estàtics es criden sense realitzar una instantània de la seva classe o instantiating their class nor are they callable when the class is instantiated</u>. Els mètodes estàtics s'utilitzen sovint per crear funcions d'utilitat per una aplicació.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<p>L'exemple següent mostra diverses coses. Mostra com un mètode estàtic és implementat en una classe i que una classe amb un membre estàtic pot tenir subclasses. Finalment, mostra com es pot i com no es pot cridar un mètode estàtic.</p>
+
+<pre class="brush: js">class Tripple {
+  static tripple(n) {
+    n = n | 1;
+    return n * 3;
+  }
+}
+
+class BiggerTripple extends Tripple {
+  static tripple(n) {
+    return super.tripple(n) * super.tripple(n);
+  }
+}
+
+console.log(Tripple.tripple());
+console.log(Tripple.tripple(6));
+console.log(BiggerTripple.tripple(3));
+var tp = new Tripple();
+console.log(tp.tripple()); //Logs 'tp.tripple is not a function'.</pre>
+
+<h2 id="Especificacions">Especificacions</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Especificació</th>
+   <th scope="col">Estat</th>
+   <th scope="col">Comentaris</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-class-definitions', 'Class definitions')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Definició inicial.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilitat_amb_navegadors">Compatibilitat amb navegadors</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatChrome(42.0)}}</td>
+   <td>Disponible només en el canal Nightly  (desde febrer del 2015)</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Característica</th>
+   <th>Android</th>
+   <th>Chrome per Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Suport bàsic</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(42.0)}}</td>
+   <td>Disponible només en el canal Nightly  (desde febrer del 2015)</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Vegeu_també">Vegeu també</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/class">expressió </a><a href="/en-US/docs/Web/JavaScript/Reference/Operators/class"><code>class</code> </a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/class">declaració </a><a href="/en-US/docs/Web/JavaScript/Reference/Statements/class"><code>class</code> </a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Classes">Classes</a></li>
+</ul>