{"json_modified": "2016-03-28T08:37:18.318719", "uuid": "d71dd022-52ea-4b88-a6db-a6db62dc0d16", "title": "Mutable", "url": "/en-US/docs/Glossary/Mutable", "tags": ["NeedsContent", "CodingScripting", "Glossary"], "translations": [], "modified": "2015-07-15T18:25:15", "label": "Mutable", "localization_tags": [], "locale": "en-US", "id": 125723, "last_edit": "2015-07-15T18:25:13", "summary": "<em>Mutable</em> is a type of variable that can be changed. In <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/JavaScript\" title=\"JavaScript: JavaScript (JS) is a programming language mostly used client-side to dynamically script webpages, but often also server-side.\">JavaScript</a>, only <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Object\" title=\"objects: Object refers to a data structure containing data and instructions for working with the data. Objects sometimes refer to real-world things, for example a car or map object in a racing game. JavaScript, Java, C++,&#xA0;Python, and Ruby are examples of object-oriented programming languages.\">objects</a> and <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/Array\" title=\"arrays: An array is an ordered collection of data (either primitive or object). Based on its place in the array, each data item has a numeric index through which you can access the corresponding value.&#xA0;In JavaScript, arrays are also objects that can be manipulated with various methods.\">arrays</a> are mutable, not <a class=\"glossaryLink\" href=\"/en-US/docs/Glossary/primitive\" title=\"primitive values: A primitive (primitive value, primitive data type) is data that is not an object and has no methods.\">primitive values</a>.", "sections": [{"id": "Learn_more", "title": "Learn more"}, {"id": "General_knowledge", "title": "General knowledge"}], "slug": "Glossary/Mutable", "review_tags": []}