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----
-title: JavaScript error reference
-slug: Web/JavaScript/Reference/Errors
-tags:
- - Debugging
- - Error
- - Errors
- - Exception
- - JavaScript
- - NeedsTranslation
- - TopicStub
- - exceptions
-translation_of: Web/JavaScript/Reference/Errors
----
-<p>{{jsSidebar("Errors")}}</p>
-
-<p>Below, you'll find a list of errors which are thrown by JavaScript. These errors can be a helpful debugging aid, but the reported problem isn't always immediately clear. The pages below will provide additional details about these errors. Each error is an object based upon the {{jsxref("Error")}} object, and has a <code>name</code> and a <code>message</code>.</p>
-
-<p>Errors displayed in the Web console may include a link to the corresponding page below to help you quickly comprehend the problem in your code.</p>
-
-<h2 id="List_of_errors">List of errors</h2>
-
-<p>In this list, each page is listed by name (the type of error) and message (a more detailed human-readable error message). Together, these two properties provide a starting point toward understanding and resolving the error. For more information, follow the links below!</p>
-
-<p>{{ListSubPages("/en-US/docs/Web/JavaScript/Reference/Errors")}}</p>
-
-<h2 id="See_also">See also</h2>
-
-<ul>
- <li><a href="/en-US/docs/Learn/JavaScript/First_steps/What_went_wrong">What went wrong? Troubleshooting JavaScript</a>: Beginner's introductory tutorial on fixing JavaScript errors.</li>
-</ul>
diff --git a/files/bg/web/javascript/reference/errors/unexpected_type/index.html b/files/bg/web/javascript/reference/errors/unexpected_type/index.html
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----
-title: 'TypeError: "x" is (not) "y"'
-slug: Web/JavaScript/Reference/Errors/Unexpected_type
-tags:
- - JavaScript
- - TypeError
- - Грешки
-translation_of: Web/JavaScript/Reference/Errors/Unexpected_type
----
-<div>{{jsSidebar("Errors")}}</div>
-
-<h2 id="Съобщение">Съобщение</h2>
-
-<pre class="syntaxbox">TypeError: "x" is (not) "y"
-
-Примери:
-TypeError: "x" is undefined
-TypeError: "x" is null
-TypeError: "undefined" is not an object
-TypeError: "x" is not an object or null
-TypeError: "x" is not a symbol
-</pre>
-
-<h2 id="Вид_на_грешката">Вид на грешката</h2>
-
-<p>{{jsxref("TypeError")}}.</p>
-
-<h2 id="Какво_се_обърка"><span class="short_text" id="result_box" lang="bg"><span>Какво се обърка?</span></span></h2>
-
-<p>Върнатият тип не отговаря на очакванията. Това се случва често при върната стойност {{jsxref("undefined")}} или {{jsxref("null")}}.</p>
-
-<p>Някои методи като {{jsxref("Object.create()")}} или {{jsxref("Symbol.keyFor()")}} освен това изискват да им бъде предоставен определен тип.</p>
-
-<h2 id="Примери">Примери</h2>
-
-<h3 id="Случаи_предизвикващи_грешката">Случаи, предизвикващи грешката</h3>
-
-<pre class="brush: js example-bad">// Случаи, при които методът substring няма да работи.
-// Такива са undefined и null.
-var foo = undefined;
-foo.substring(1); // TypeError: foo is undefined
-
-var foo = null;
-foo.substring(1); // TypeError: foo is null
-
-
-// Методи, които очакват да бъдат извикани
-// върху точно определен тип.
-var foo = {}
-Symbol.keyFor(foo); // TypeError: foo is not a symbol
-
-var foo = 'bar'
-Object.create(foo); // TypeError: "foo" is not an object or null
-</pre>
-
-<h3 id="Поправяне_на_грешката">Поправяне на грешката</h3>
-
-<p>За да оправите грешката в случай на указател, сочещ към стойност <code>undefined</code> или <code>null</code>, можете да използвате оператора <a href="/en-US/docs/Web/JavaScript/Reference/Operators/typeof">typeof</a>.</p>
-
-<pre class="brush: js">if (typeof foo !== 'undefined') {
- // Сега знаем, че foo има определена стойност
- // и можем да продължим.
-}</pre>
-
-<h2 id="Вижте_също">Вижте също</h2>
-
-<ul>
- <li>{{jsxref("undefined")}}</li>
- <li>{{jsxref("null")}}</li>
-</ul>