Editing JavaScript (section)

==== Functions as roles (Traits and Mixins) ====
{{Main|Role-oriented programming|Traits (computer science)|Mixin}}

JavaScript natively supports various function-based implementations of [[Role-oriented programming|Role]]<ref>[https://peterseliger.blogspot.de/2014/04/the-many-talents-of-javascript.html#the-many-talents-of-javascript-for-generalizing-role-oriented-programming-approaches-like-traits-and-mixins The many talents of JavaScript for generalizing Role-Oriented Programming approaches like Traits and Mixins] {{Webarchive|url=https://web.archive.org/web/20171005050713/https://peterseliger.blogspot.de/2014/04/the-many-talents-of-javascript.html#the-many-talents-of-javascript-for-generalizing-role-oriented-programming-approaches-like-traits-and-mixins |date=2017-10-05 }}, Peterseliger.blogspot.de, April 11, 2014.</ref> patterns like [[Traits (computer science)|Traits]]<ref>[https://soft.vub.ac.be/~tvcutsem/traitsjs/ Traits for JavaScript] {{Webarchive|url=https://web.archive.org/web/20140724052500/https://soft.vub.ac.be/~tvcutsem/traitsjs/ |date=2014-07-24 }}, 2010.</ref><ref>{{cite web |url=https://cocktailjs.github.io/ |title=Home &#124; CocktailJS |website=Cocktailjs.github.io |access-date=February 24, 2017 |archive-date=February 4, 2017 |archive-url=https://web.archive.org/web/20170204083608/https://cocktailjs.github.io/ |url-status=live }}</ref> and [[Mixin]]s.<ref>{{cite web |url-status=live |first1=Angus |last1=Croll |url=https://javascriptweblog.wordpress.com/2011/05/31/a-fresh-look-at-javascript-mixins/ |title=A fresh look at JavaScript Mixins |archive-url=https://web.archive.org/web/20200415004603/https://javascriptweblog.wordpress.com/2011/05/31/a-fresh-look-at-javascript-mixins/ |archive-date=2020-04-15 |date=May 31, 2011 |website= JavaScript, JavaScript… }}</ref> Such a function defines additional behavior by at least one method bound to the <code>this</code> keyword within its <code>function</code> body. A Role then has to be delegated explicitly via <code>call</code> or <code>apply</code> to objects that need to feature additional behavior that is not shared via the prototype chain.