{"json_modified": "2015-05-06T12:12:33.116188", "slug": "Web/JavaScript/Referencia/Objectes_globals/undefined", "tags": [], "locale": "ca", "title": "undefined", "translations": [{"title": "undefined", "url": "/en-US/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": ["JavaScript"], "summary": "The global <code><strong>undefined</strong></code> property represents the primitive value <code><a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Undefined\" title=\"undefined: A primitive value automatically assigned to variables that have just been declared or to formal arguments for which there are no actual arguments.\">undefined</a></code>. It is one of JavaScript's <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Primitive\" title=\"primitive types: A primitive (primitive value, primitive data type) is data that is not an object and has no methods.\">primitive types</a>.", "localization_tags": [], "locale": "en-US", "last_edit": "2015-03-27T02:31:42", "review_tags": []}, {"title": "undefined", "url": "/ja/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": ["JavaScript"], "summary": "\u672a\u5b9a\u7fa9\u3067\u3042\u308b\u4e8b\u3092\u610f\u5473\u3059\u308b\u5024\u3002", "localization_tags": ["inprogress"], "locale": "ja", "last_edit": "2015-04-15T00:51:20", "review_tags": []}, {"title": "undefined", "url": "/es/docs/Web/JavaScript/Referencia/Objetos_globales/undefined", "tags": ["JavaScript"], "summary": "El valor undefined.", "localization_tags": [], "locale": "es", "last_edit": "2014-11-19T12:26:22", "review_tags": []}, {"title": "undefined", "url": "/pl/docs/Web/JavaScript/Referencje/Obiekty/undefined", "tags": ["JavaScript"], "summary": "Warto\u015b\u0107 niezdefiniowana.", "localization_tags": [], "locale": "pl", "last_edit": "2015-04-25T02:23:27", "review_tags": []}, {"title": "undefined", "url": "/fr/docs/Web/JavaScript/Reference/Objets_globaux/undefined", "tags": ["R\u00e9f\u00e9rence", "Reference", "R\u00e9ference", "JavaScript"], "summary": "La propri\u00e9t\u00e9 globale <strong><code>undefined</code></strong> repr\u00e9sente la valeur <code>undefined</code><em>.</em> Cette valeur est l'<a href=\"/fr/docs/Web/JavaScript/Structures_de_donn&#xE9;es#Le_type_ind.C3.A9fini\">un des types primitifs de JavaScript</a>.", "localization_tags": [], "locale": "fr", "last_edit": "2015-04-07T13:38:37", "review_tags": []}, {"title": "undefined", "url": "/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": [], "summary": "<code>undefined</code>\u6709\u591a\u91cd\u89d2\u8272,\u901a\u5e38\u60c5\u51b5\u4e0b,\u6211\u4eec\u6240\u8bf4\u7684<code>undefined</code>\u90fd\u6307\u7684\u662f\u5168\u5c40\u5bf9\u8c61\u7684\u4e00\u4e2a\u5c5e\u6027<code>\"undefined\"</code>.", "localization_tags": [], "locale": "zh-CN", "last_edit": "2015-04-18T00:35:31", "review_tags": []}, {"title": "undefined", "url": "/ru/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": ["JavaScript"], "summary": "\u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0433\u043b\u043e\u0431\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 <code><strong>undefined</strong></code> \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 <code>undefined</code>. \u042d\u0442\u043e \u043e\u0434\u043d\u043e \u0438\u0437 <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Primitive\" title=\"&#x43F;&#x440;&#x438;&#x43C;&#x438;&#x442;&#x438;&#x432;&#x43D;&#x44B;&#x445; &#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x439;: A primitive (primitive value, primitive data type) is data that is not an object and has no methods.\">\u043f\u0440\u0438\u043c\u0438\u0442\u0438\u0432\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439</a> JavaScript.", "localization_tags": [], "locale": "ru", "last_edit": "2014-11-19T12:37:14", "review_tags": []}, {"title": "undefined", "url": "/de/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": ["JavaScript"], "summary": "Die globale Eigenschaft <code><strong>undefined</strong></code> repr\u00e4sentiert den Wert <code>undefined</code>. Dieser Wert ist einer der <a class=\"glossaryLink\" href=\"/de/docs/Glossary/Primitive\" title=\"Die Definition dieses Ausdrucks (primitiven Typen) wurde noch nicht geschrieben; bitte hilf mit und trage sie bei!\">primitiven Typen</a> in JavaScript.", "localization_tags": [], "locale": "de", "last_edit": "2015-01-21T01:35:47", "review_tags": []}, {"title": "undefined", "url": "/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": [], "summary": "O valor global <code>undefined</code> representa um valor indefinido. Trata-se de um dos\u00a0<a class=\"glossaryLink\" href=\"/pt-BR/docs/Glossario/Primitivo\" title=\"tipos primitivos: Um&#xA0;primitivo&#xA0;(valor primitivo, tipo de dados primitivo) &#xE9; um dado que n&#xE3;o &#xE9; representado atrav&#xE9;s de um&#xA0;Objeto e, por consequ&#xEA;ncia, n&#xE3;o possui m&#xE9;todos.\">tipos primitivos</a> do JavaScript.", "localization_tags": [], "locale": "pt-BR", "last_edit": "2015-02-15T15:36:33", "review_tags": []}, {"title": "undefined", "url": "/it/docs/Web/JavaScript/Reference/Global_Objects/undefined", "tags": [], "summary": "La variabile globale\u00a0<strong><code>undefined</code></strong>\u00a0rappresenta il valore primitivo\u00a0<span style=\"font-family: Consolas, Monaco, 'Andale Mono', monospace;\"><a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Undefined\" title=\"undefined: A primitive value automatically assigned to variables that have just been declared or to formal arguments for which there are no actual arguments.\">undefined</a></span>.\u00a0\u00c8 uno dei <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Primitive\" title=\"valori primitivi: A primitive (primitive value, primitive data type) is data that is not an object and has no methods.\">valori primitivi</a> di JavaScript.", "localization_tags": [], "locale": "it", "last_edit": "2015-04-12T06:23:10", "review_tags": []}], "modified": "2015-05-06T12:10:05", "label": "undefined", "localization_tags": [], "url": "/ca/docs/Web/JavaScript/Referencia/Objectes_globals/undefined", "last_edit": "2015-05-06T12:09:38", "summary": "El valor de la propietat global <code><strong>undefined</strong></code> representa el valor <code>undefined</code>. \u00c9s un dels <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Primitive\" title=\"tipus primitius: A primitive (primitive value, primitive data type) is data that is not an object and has no methods.\">tipus primitius</a> de JavaScript.", "sections": [{"id": "Quick_Links", "title": "JavaScript Tutorials: JavaScript Guide Introduction Grammar and types Control flow and error handling Loops and iteration Functions Expressions and operators Numbers and dates Text formatting Regular expressions Indexed collections Keyed collections Working with objects Details of the object model Iterators and generators Meta programming Introductory JavaScript basics JavaScript technologies overview Introduction to Object Oriented JavaScript Intermediate A re-introduction to JavaScript JavaScript data structures Equality comparisons and sameness Closures Advanced Inheritance and the prototype chain Strict mode JavaScript typed arrays Memory Management Concurrency model and Event Loop References: Built-in objects Objectes Standard Array [Traduir] ArrayBuffer [Traduir] Boolean DataView [Traduir] Date Error EvalError [Traduir] Float32Array [Traduir] Float64Array [Traduir] Function [Traduir] Generator [Traduir] GeneratorFunction [Traduir] Infinity Int16Array [Traduir] Int32Array [Traduir] Int8Array [Traduir] InternalError [Traduir] Intl [Traduir] Intl.Collator [Traduir] Intl.DateTimeFormat [Traduir] Intl.NumberFormat [Traduir] Iterator [Traduir] JSON Map Math NaN Number Object [Traduir] ParallelArray [Traduir] Promise [Traduir] Proxy [Traduir] RangeError [Traduir] ReferenceError [Traduir] Reflect [Traduir] RegExp [Traduir] SIMD [Traduir] SIMD.float32x4 [Traduir] SIMD.float64x2 [Traduir] SIMD.int16x8 [Traduir] SIMD.int32x4 [Traduir] SIMD.int8x16 [Traduir] Set [Traduir] StopIteration [Traduir] String Symbol [Traduir] SyntaxError [Traduir] TypeError [Traduir] TypedArray [Traduir] URIError [Traduir] Uint16Array [Traduir] Uint32Array [Traduir] Uint8Array [Traduir] Uint8ClampedArray [Traduir] WeakMap [Traduir] WeakSet [Traduir] decodeURI() [Traduir] decodeURIComponent() [Traduir] encodeURI() [Traduir] encodeURIComponent() [Traduir] escape() [Traduir] eval() [Traduir] isFinite() [Traduir] isNaN() [Traduir] null parseFloat() [Traduir] parseInt() [Traduir] undefined unescape() [Traduir] uneval() [Traduir] Expressions & operators Expressions and operators Operadors aritm\u00e8tics Array comprehensions [Traduir] Assignment operators Operadors de bits Operador Coma Comparison operators [Traduir] Operador Condicional (ternari) Destructuring assignment [Traduir] Expression closures [Traduir] Generator comprehensions [Traduir] Operador d'agrupament Legacy generator function expression [Traduir] Operadors L\u00f2gics Object initializer [Traduir] Operator precedence [Traduir] Property accessors [Traduir] Spread operator [Traduir] class expression [Traduir] Operador delete function expression [Traduir] function* expression [Traduir] in operator [Traduir] instanceof [Traduir] new operator [Traduir] super this [Traduir] typeof L'operador void yield yield* [Traduir] Statements & declarations Statements and declarations Legacy generator function [Traduir] block break [Traduir] class [Traduir] const [Traduir] continue [Traduir] debugger [Traduir] do...while [Traduir] Buida export [Traduir] for for each...in [Traduir] for...in [Traduir] for...of function function* [Traduir] if...else import [Traduir] label [Traduir] let [Traduir] return switch [Traduir] throw [Traduir] try...catch [Traduir] var [Traduir] while with [Traduir] Functions Functions [Traduir] Arguments object [Traduir] Arrow functions [Traduir] Default parameters [Traduir] Method definitions [Traduir] Rest parameters [Traduir] getter [Traduir] setter [Traduir] Classes Classes constructor extends [Traduir] static Misc Lexical grammar JavaScript data structures Enumerability and ownership of properties Iteration protocols Strict mode Transitioning to strict mode Template strings Deprecated features New in JavaScript New in JavaScript [Traduir] ECMAScript 5 support in Mozilla [Traduir] ECMAScript 6 support in Mozilla [Traduir] ECMAScript 7 support in Mozilla [Traduir] Firefox JavaScript changelog [Traduir] New in JavaScript 1.1 [Traduir] New in JavaScript 1.2 [Traduir] New in JavaScript 1.3 [Traduir] New in JavaScript 1.4 [Traduir] New in JavaScript 1.5 [Traduir] New in JavaScript 1.6 [Traduir] New in JavaScript 1.7 [Traduir] New in JavaScript 1.8 [Traduir] New in JavaScript 1.8.1 [Traduir] New in JavaScript 1.8.5 [Traduir] Documentation: Useful lists All pages index Methods index Properties index Pages tagged \"JavaScript\" Contribute JavaScript doc status The MDN project"}, {"id": "Summary", "title": "Resum"}, {"id": "Syntax", "title": "Sintaxi"}, {"id": "Description", "title": "Descripci\u00f3"}, {"id": "Exemples", "title": "Exemples"}, {"id": "Igualtat_estricta_i_undefined", "title": "Igualtat estricta i undefined"}, {"id": "L'operador_Typeof_i_undefined", "title": "L'operador Typeof i undefined"}, {"id": "L'operador_Void_i_undefined", "title": "L'operador Void i undefined"}, {"id": "Especificacions", "title": "Especificacions"}, {"id": "Compatibilitat_amb_navegadors", "title": "Compatibilitat amb navegadors"}], "id": 135555, "review_tags": ["editorial"]}