Editing JavaScript (section)

=== Dynamic ===
{{Main|Dynamic Programming}}

==== Typing ====
{{Main|Dynamic typing}}

JavaScript is [[dynamic typing|dynamically typed]] like most other [[scripting language]]s. A [[type system|type]] is associated with a [[value (computer science)|value]] rather than an expression. For example, a [[Variable (programming)|variable]] initially bound to a number may be reassigned to a [[string (computer science)|string]].<ref>{{cite web|url=https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures|title=JavaScript data types and data structures |date=February 16, 2017|website=MDN |access-date=February 24, 2017|archive-date=March 14, 2017|archive-url=https://web.archive.org/web/20170314230542/https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures|url-status=live}}</ref> JavaScript supports various ways to test the type of objects, including [[duck typing]].{{Sfn|Flanagan|2006|pp=176–178}}

==== Run-time evaluation ====
{{Main|eval}}
JavaScript includes an <code>[[eval]]</code> function that can execute statements provided as strings at run-time.