Editing JavaScript (section)

=== Imperative and structured ===
{{Main|Structured programming}}

JavaScript supports much of the [[structured programming]] syntax from [[C (computer language)|C]] (e.g., <code>if</code> statements, <code>while</code> loops, <code>switch</code> statements, <code>do while</code> loops, etc.). One partial exception is [[scope (computer science)|scoping]]: originally JavaScript only had [[function scoping]] with <code>var</code>; [[block scoping]] was added in ECMAScript 2015 with the keywords <code>let</code> and <code>[[const (computer programming)|const]]</code>. Like C, JavaScript makes a distinction between [[Expression (computer science)|expressions]] and [[Statement (computer science)|statements]]. One syntactic difference from C is [[Defensive semicolon|automatic semicolon insertion]], which allow semicolons (which terminate statements) to be omitted.<ref name="Flanagan2006">{{cite book|last=Flanagan|first=David|title=JavaScript: The Definitive Guide |url=https://books.google.com/books?id=2weL0iAfrEMC|date=August 17, 2006|publisher=[[O'Reilly Media, Inc.]]|isbn=978-0-596-55447-7|page=16|access-date=March 29, 2019|archive-date=August 1, 2020|archive-url=https://web.archive.org/web/20200801065235/https://books.google.com/books?id=2weL0iAfrEMC|url-status=live}}</ref>