delete pages that were never translated from en-US (pl, part 1) (#1549)

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diff --git a/files/pl/web/javascript/reference/operators/instanceof/index.html b/files/pl/web/javascript/reference/operators/instanceof/index.html
deleted file mode 100644
index bd98d29e0f..0000000000
--- a/files/pl/web/javascript/reference/operators/instanceof/index.html
+++ /dev/null
@@ -1,169 +0,0 @@
----
-title: Operator instanceof
-slug: Web/JavaScript/Reference/Operators/instanceof
-tags:
-  - Dokumentacja_JavaScript
-  - Dokumentacje
-  - JavaScript
-  - Strony_wymagające_dopracowania
-  - Wszystkie_kategorie
-translation_of: Web/JavaScript/Reference/Operators/instanceof
-original_slug: Web/JavaScript/Referencje/Operatory/Operator_instanceof
----
-<div>{{jsSidebar("Operators")}}</div>
-
-<p><strong>Operator</strong> <strong><code>instanceof</code> </strong>sprawdza czy właściwość konstruktora <code>prototype</code> pojawia się gdziekolwiek w łańcuchu prototypowym obiektu.</p>
-
-<p>{{EmbedInteractiveExample("pages/js/expressions-instanceof.html")}}</p>
-
-
-
-<h2 id="Składnia">Składnia</h2>
-
-<pre class="syntaxbox"><em>object</em> instanceof <em>constructor</em></pre>
-
-<dl>
- <dt>
- <h3 id="Parametry">Parametry</h3>
- <code>object</code></dt>
- <dd>Obiekt do testowania.</dd>
-</dl>
-
-<dl>
- <dt><code>constructor</code></dt>
- <dd>Funkcja przeciwko której testujemy.</dd>
-</dl>
-
-<h2 id="Opis">Opis</h2>
-
-<p>Operator <code>instanceof</code> sprawdza obecność <code>constructor.prototype</code> w łańcuchu prototypowym obiektu <code>object</code></p>
-
-<pre class="brush: js">// definiowanie konstruktorów
-function C() {}
-function D() {}
-
-var o = new C();
-
-// true, ponieważ: Object.getPrototypeOf(o) === C.prototype
-o instanceof C;
-
-// false, ponieważ D.prototype nie występuje w łańcuchu prototypowym o.
-o instanceof D;
-
-o instanceof Object; // true, ponieważ:
-C.prototype instanceof Object // true
-
-C.prototype = {};
-var o2 = new C();
-
-o2 instanceof C; // true
-
-// false, ponieważ C.prototype nie ma już w łańcuchu prototypowym o
-o instanceof C;
-
-D.prototype = new C(); // add C to [[Prototype]] linkage of D
-var o3 = new D();
-o3 instanceof D; // true
-o3 instanceof C; // true since C.prototype is now in o3's prototype chain
-</pre>
-
-<p>Note that the value of an <code>instanceof</code> test can change based on changes to the <code>prototype</code> property of constructors, and it can also be changed by changing an object prototype using <code>Object.setPrototypeOf</code>. It is also possible using the non-standard <code>__proto__</code> pseudo-property.</p>
-
-<h3 id="instanceof_and_multiple_context_(e.g._frames_or_windows)"><code>instanceof</code> and multiple context (e.g. frames or windows)</h3>
-
-<p>Different scopes have different execution environments. This means that they have different built-ins (different global object, different constructors, etc.). This may result in unexpected results. For instance, <code>[] instanceof window.frames[0].Array</code> will return <code>false</code>, because <code>Array.prototype !== </code><code>window.frames[0].Array</code> and arrays inherit from the former.</p>
-
-<p>This may not make sense at first but when you start dealing with multiple frames or windows in your script and pass objects from one context to another via functions, this will be a valid and strong issue. For instance, you can securely check if a given object is, in fact, an Array using <code>Array.isArray(myObj)</code></p>
-
-<p>For example checking if a <a href="/en-US/docs/Web/API/Node">Nodes</a> is a <a href="/en-US/docs/Web/API/SVGElement">SVGElement</a> in a different context you can use <code>myNode instanceof myNode.ownerDocument.defaultView.SVGElement</code></p>
-
-<div class="note"><strong>Note for Mozilla developers:</strong><br>
-In code using XPCOM <code>instanceof</code> has special effect: <code>obj instanceof </code><em><code>xpcomInterface</code></em> (e.g. <code>Components.interfaces.nsIFile</code>) calls <code>obj.QueryInterface(<em>xpcomInterface</em>)</code> and returns <code>true</code> if QueryInterface succeeded. A side effect of such call is that you can use <em><code>xpcomInterface</code></em>'s properties on <code>obj</code> after a successful <code>instanceof</code> test. Unlike standard JavaScript globals, the test <code>obj instanceof xpcomInterface</code> works as expected even if <code>obj</code> is from a different scope.</div>
-
-<h2 id="Examples">Examples</h2>
-
-<h3 id="Demonstrating_that_String_and_Date_are_of_type_Object_and_exceptional_cases">Demonstrating that <code>String</code> and <code>Date</code> are of type <code>Object</code> and exceptional cases</h3>
-
-<p>The following code uses <code>instanceof</code> to demonstrate that <code>String</code> and <code>Date</code> objects are also of type <code>Object</code> (they are derived from <code>Object</code>).</p>
-
-<p>However, objects created with the object literal notation are an exception here: Although the prototype is undefined, <code>instanceof Object</code> returns <code>true</code>.</p>
-
-<pre class="brush: js">var simpleStr = 'This is a simple string';
-var myString  = new String();
-var newStr    = new String('String created with constructor');
-var myDate    = new Date();
-var myObj     = {};
-
-simpleStr instanceof String; // returns false, checks the prototype chain, finds undefined
-myString  instanceof String; // returns true
-newStr    instanceof String; // returns true
-myString  instanceof Object; // returns true
-
-myObj instanceof Object;    // returns true, despite an undefined prototype
-({})  instanceof Object;    // returns true, same case as above
-
-myString instanceof Date;   // returns false
-
-myDate instanceof Date;     // returns true
-myDate instanceof Object;   // returns true
-myDate instanceof String;   // returns false
-</pre>
-
-<h3 id="Demonstrating_that_mycar_is_of_type_Car_and_type_Object">Demonstrating that <code>mycar</code> is of type <code>Car</code> and type <code>Object</code></h3>
-
-<p>The following code creates an object type <code>Car</code> and an instance of that object type, <code>mycar</code>. The <code>instanceof</code> operator demonstrates that the <code>mycar</code> object is of type <code>Car</code> and of type <code>Object</code>.</p>
-
-<pre class="brush: js">function Car(make, model, year) {
-  this.make = make;
-  this.model = model;
-  this.year = year;
-}
-var mycar = new Car('Honda', 'Accord', 1998);
-var a = mycar instanceof Car;    // returns true
-var b = mycar instanceof Object; // returns true
-</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('ESDraft', '#sec-relational-operators', 'Relational Operators')}}</td>
-   <td>{{Spec2('ESDraft')}}</td>
-   <td> </td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES6', '#sec-relational-operators', 'Relational Operators')}}</td>
-   <td>{{Spec2('ES6')}}</td>
-   <td> </td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES5.1', '#sec-11.8.6', 'The instanceof operator')}}</td>
-   <td>{{Spec2('ES5.1')}}</td>
-   <td> </td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES3', '#sec-11.8.6', 'The instanceof operator')}}</td>
-   <td>{{Spec2('ES3')}}</td>
-   <td>Initial definition. Implemented in JavaScript 1.4.</td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-
-
-<p>{{Compat("javascript.operators.instanceof")}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/typeof" title="/en-US/docs/JavaScript/Reference/Operators/typeof">typeof</a></code></li>
- <li>{{jsxref("Symbol.hasInstance")}}</li>
-</ul>
diff --git a/files/pl/web/javascript/reference/operators/this/index.html b/files/pl/web/javascript/reference/operators/this/index.html
deleted file mode 100644
index 427d3f843e..0000000000
--- a/files/pl/web/javascript/reference/operators/this/index.html
+++ /dev/null
@@ -1,347 +0,0 @@
----
-title: this
-slug: Web/JavaScript/Reference/Operators/this
-translation_of: Web/JavaScript/Reference/Operators/this
-original_slug: Web/JavaScript/Referencje/Operatory/this
----
-<div>
-<div>{{jsSidebar("Operators")}}</div>
-</div>
-
-<h2 id="Summary">Summary</h2>
-
-<p>W JavaScript słówko kluczowe <code>this</code> zachowuje się nieco inaczej w porównaniu do innych języków programowania. Istnieje również kilka różnic między trybem <a href="/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode">strict mode</a> oraz non-strict mode.</p>
-
-<p>W większości przypadków wartość <code>this</code> jest ustalana na podstawie tego, jak wywołana została dana funkcja. Wartość ta nie może być przypisana podczas wykonywania się funkcji i może być inna za każdym wywołaniem. ES5 wprowadziło metodę <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind">bind</a></code> dzięki której <a href="#The_bind_method">możemy przypisać wartość <code>this</code> w funkcji, niezależnie od tego jak została ona wywołana.</a></p>
-
-<h2 id="Syntax">Syntax</h2>
-
-<pre class="syntaxbox">this</pre>
-
-<h2 id="Global_context">Global context</h2>
-
-<p>In the global execution context (outside of any function), <code>this</code> refers to the global object, whether in strict mode or not.</p>
-
-<pre class="brush:js">console.log(this.document === document); // true
-
-// In web browsers, the window object is also the global object:
-console.log(this === window); // true
-
-this.a = 37;
-console.log(window.a); // 37
-</pre>
-
-<h2 id="Function_context">Function context</h2>
-
-<p>Inside a function, the value of <code>this</code> depends on how the function is called.</p>
-
-<h3 id="Simple_call">Simple call</h3>
-
-<pre class="brush:js">function f1(){
-  return this;
-}
-
-f1() === window; // global object
-</pre>
-
-<p>In this case, the value of <code>this</code> is not set by the call. Since the code is not in strict mode, the value of <code>this</code> must always be an object so it defaults to the global object.</p>
-
-<pre class="brush:js">function f2(){
-  "use strict"; // see strict mode
-  return this;
-}
-
-f2() === undefined;
-</pre>
-
-<p>In strict mode, the value of <code>this</code> remains at whatever it's set to when entering the execution context. If it's not defined, it remains undefined. It can also be set to any value, such as <code>null</code> or <code>42</code> or <code>"I am not this"</code>.</p>
-
-<div class="note"><strong>Note:</strong> In the second example, <code>this</code> should be <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined"><code>undefined</code></a>, because <code>f2</code> was called without providing any base (e.g. <code>window.f2()</code>). This feature wasn't implemented in some browsers when they first started to support <a href="/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode" title="Strict mode">strict mode</a>. As a result, they incorrectly returned the <code>window</code> object.</div>
-
-<h3 id="As_an_object_method">As an object method</h3>
-
-<p>When a function is called as a method of an object, its <code>this</code> is set to the object the method is called on.</p>
-
-<p>In the following example, when <code>o.f()</code> is invoked, inside the function <code>this</code> is bound to the <code>o</code> object.</p>
-
-<pre class="brush:js">var o = {
-  prop: 37,
-  f: function() {
-    return this.prop;
-  }
-};
-
-console.log(o.f()); // logs 37
-</pre>
-
-<p>Note that this behavior is not at all affected by how or where the function was defined. In the previous example, we defined the function inline as the <code>f</code> member during the definition of <code>o</code>. However, we could have just as easily defined the function first and later attached it to <code>o.f</code>. Doing so results in the same behavior:</p>
-
-<pre class="brush:js">var o = {prop: 37};
-
-function independent() {
-  return this.prop;
-}
-
-o.f = independent;
-
-console.log(o.f()); // logs 37
-</pre>
-
-<p>This demonstrates that it matters only that the function was invoked from the <code>f</code> member of <code>o</code>.</p>
-
-<p>Similarly, the <code>this</code> binding is only affected by the most immediate member reference. In the following example, when we invoke the function, we call it as a method <code>g</code> of the object <code>o.b</code>. This time during execution, <code>this</code> inside the function will refer to <code>o.b</code>. The fact that the object is itself a member of <code>o</code> has no consequence; the most immediate reference is all that matters.</p>
-
-<pre class="brush:js">o.b = {g: independent, prop: 42};
-console.log(o.b.g()); // logs 42
-</pre>
-
-<h4 id="this_on_the_objects_prototype_chain"><code>this</code> on the object's prototype chain</h4>
-
-<p>The same notion holds true for methods defined somewhere on the object's prototype chain. If the method is on an object's prototype chain, <code>this</code> refers to the object the method was called on, as if the method was on the object.</p>
-
-<pre class="brush:js">var o = {f:function(){ return this.a + this.b; }};
-var p = Object.create(o);
-p.a = 1;
-p.b = 4;
-
-console.log(p.f()); // 5
-</pre>
-
-<p>In this example, the object assigned to the variable <code>p</code> doesn't have its own <code>f</code> property, it inherits it from its prototype. But it doesn't matter that the lookup for <code>f</code> eventually finds a member with that name on <code>o</code>; the lookup began as a reference to <code>p.f</code>, so <code>this</code> inside the function takes the value of the object referred to as <code>p</code>. That is, since <code>f</code> is called as a method of <code>p</code>, its <code>this</code> refers to <code>p</code>. This is an interesting feature of JavaScript's prototype inheritance.</p>
-
-<h4 id="this_with_a_getter_or_setter"><code>this</code> with a getter or setter</h4>
-
-<p>Again, the same notion holds true when a function is invoked from a getter or a setter. A function used as getter or setter has its <code>this</code> bound to the object from which the property is being set or gotten.</p>
-
-<pre class="brush:js">function modulus(){
-  return Math.sqrt(this.re * this.re + this.im * this.im);
-}
-
-var o = {
-  re: 1,
-  im: -1,
-  get phase(){
-    return Math.atan2(this.im, this.re);
-  }
-};
-
-Object.defineProperty(o, 'modulus', {
-    get: modulus, enumerable:true, configurable:true});
-
-console.log(o.phase, o.modulus); // logs -0.78 1.4142
-</pre>
-
-<h3 id="As_a_constructor">As a constructor</h3>
-
-<p>When a function is used as a constructor (with the <code><a href="/en-US/docs/Web/JavaScript/Reference/Operators/new">new</a></code> keyword), its <code>this</code> is bound to new object being constructed.</p>
-
-<p>Note: while the default for a constructor is to return the object referenced by <code>this</code>, it can instead return some other object (if the return value isn't an object, then the <code>this</code> object is returned).</p>
-
-<pre class="brush:js">/*
- * Constructors work like this:
- *
- * function MyConstructor(){
- *   // Actual function body code goes here.
- *   // Create properties on |this| as
- *   // desired by assigning to them.  E.g.,
- *   this.fum = "nom";
- *   // et cetera...
- *
- *   // If the function has a return statement that
- *   // returns an object, that object will be the
- *   // result of the |new| expression.  Otherwise,
- *   // the result of the expression is the object
- *   // currently bound to |this|
- *   // (i.e., the common case most usually seen).
- * }
- */
-
-function C(){
-  this.a = 37;
-}
-
-var o = new C();
-console.log(o.a); // logs 37
-
-
-function C2(){
-  this.a = 37;
-  return {a:38};
-}
-
-o = new C2();
-console.log(o.a); // logs 38
-</pre>
-
-<p>In the last example (<code>C2</code>), because an object was returned during construction, the new object that <code>this</code> was bound to simply gets discarded. (This essentially makes the statement "<code>this.a = 37;</code>" dead code. It's not exactly dead, because it gets executed, but it can be eliminated with no outside effects.)</p>
-
-<h3 id="call_and_apply"><code>call</code> and <code>apply</code></h3>
-
-<p>Where a function uses the <code>this</code> keyword in its body, its value can be bound to a particular object in the call using the <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call">call</a></code> or <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply">apply</a></code> methods that all functions inherit from <code>Function.prototype</code>.</p>
-
-<pre class="brush:js">function add(c, d){
-  return this.a + this.b + c + d;
-}
-
-var o = {a:1, b:3};
-
-// The first parameter is the object to use as
-// 'this', subsequent parameters are passed as
-// arguments in the function call
-add.call(o, 5, 7); // 1 + 3 + 5 + 7 = 16
-
-// The first parameter is the object to use as
-// 'this', the second is an array whose
-// members are used as the arguments in the function call
-add.apply(o, [10, 20]); // 1 + 3 + 10 + 20 = 34
-</pre>
-
-<p>Note that with <code>call</code> and <code>apply</code>, if the value passed as <code>this</code> is not an object, an attempt will be made to convert it to an object using the internal <code>ToObject</code> operation. So if the value passed is a primitive like <code>7</code> or <code>'foo'</code>, it will be converted to an Object using the related constructor, so the primitive number <code>7</code> is converted to an object as if by <code>new Number(7)</code> and the string <code>'foo'</code> to an object as if by <code>new String('foo'), e.g.</code></p>
-
-<pre class="brush:js">function bar() {
-  console.log(Object.prototype.toString.call(this));
-}
-
-bar.call(7); // [object Number]
-</pre>
-
-<h3 id="The_bind_method">The <code>bind</code> method</h3>
-
-<p>ECMAScript 5 introduced <code><a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind">Function.prototype.bind</a></code>. Calling <code>f.bind(someObject)</code> creates a new function with the same body and scope as <code>f</code>, but where <code>this</code> occurs in the original function, in the new function it is permanently bound to the first argument of <code>bind</code>, regardless of how the function is being used.</p>
-
-<pre class="brush:js">function f(){
-  return this.a;
-}
-
-var g = f.bind({a:"azerty"});
-console.log(g()); // azerty
-
-var o = {a:37, f:f, g:g};
-console.log(o.f(), o.g()); // 37, azerty
-</pre>
-
-<h3 id="As_a_DOM_event_handler">As a DOM event handler</h3>
-
-<p>When a function is used as an event handler, its <code>this</code> is set to the element the event fired from (some browsers do not follow this convention for listeners added dynamically with methods other than <code>addEventListener</code>).</p>
-
-<pre class="brush:js">// When called as a listener, turns the related element blue
-function bluify(e){
-  // Always true
-  console.log(this === e.currentTarget);
-  // true when currentTarget and target are the same object
-  console.log(this === e.target);
-  this.style.backgroundColor = '#A5D9F3';
-}
-
-// Get a list of every element in the document
-var elements = document.getElementsByTagName('*');
-
-// Add bluify as a click listener so when the
-// element is clicked on, it turns blue
-for(var i=0 ; i&lt;elements.length ; i++){
-  elements[i].addEventListener('click', bluify, false);
-}</pre>
-
-<h3 id="In_an_in–line_event_handler">In an in–line event handler</h3>
-
-<p>When code is called from an in–line handler, its <code>this</code> is set to the DOM element on which the listener is placed:</p>
-
-<pre class="brush:js">&lt;button onclick="alert(this.tagName.toLowerCase());"&gt;
-  Show this
-&lt;/button&gt;
-</pre>
-
-<p>The above alert shows <code>button</code>. Note however that only the outer code has its <code>this</code> set this way:</p>
-
-<pre class="brush:js">&lt;button onclick="alert((function(){return this}()));"&gt;
-  Show inner this
-&lt;/button&gt;
-</pre>
-
-<p>In this case, the inner function's <code>this</code> isn't set so it returns the global/window object (i.e. the default object in non–strict mode where <code>this</code> isn't set by the call).</p>
-
-<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>ECMAScript 1st Edition.</td>
-   <td>Standard</td>
-   <td>Initial definition. Implemented in JavaScript 1.0</td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES5.1', '#sec-11.1.1', 'The this keyword')}}</td>
-   <td>{{Spec2('ES5.1')}}</td>
-   <td></td>
-  </tr>
-  <tr>
-   <td>{{SpecName('ES6', '#sec-this-keyword', 'The this keyword')}}</td>
-   <td>{{Spec2('ES6')}}</td>
-   <td></td>
-  </tr>
- </tbody>
-</table>
-
-<h2 id="Browser_compatibility">Browser compatibility</h2>
-
-<p>{{ CompatibilityTable() }}</p>
-
-<div id="compat-desktop">
-<table class="compat-table">
- <tbody>
-  <tr>
-   <th>Feature</th>
-   <th>Chrome</th>
-   <th>Firefox (Gecko)</th>
-   <th>Internet Explorer</th>
-   <th>Opera</th>
-   <th>Safari</th>
-  </tr>
-  <tr>
-   <td>Basic support</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<div id="compat-mobile">
-<table class="compat-table">
- <tbody>
-  <tr>
-   <th>Feature</th>
-   <th>Android</th>
-   <th>Chrome for Android</th>
-   <th>Firefox Mobile (Gecko)</th>
-   <th>IE Mobile</th>
-   <th>Opera Mobile</th>
-   <th>Safari Mobile</th>
-  </tr>
-  <tr>
-   <td>Basic support</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-   <td>{{ CompatVersionUnknown() }}</td>
-  </tr>
- </tbody>
-</table>
-</div>
-
-<h2 id="See_also" name="See_also">See also</h2>
-
-<ul>
- <li><a href="/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/Strict_mode">Strict mode</a></li>
- <li><a href="http://bjorn.tipling.com/all-this">All this</a>, an article about <code>this</code> in different contexts</li>
-</ul>