JavaScript

This term refers to a specific technical standard and language used in web development. It carries a connotation of agility and interactivity, as it is the primary tool for changing page content without requiring a full reload. It is almost exclusively used in professional, technical, or educational contexts regarding software engineering.

As a proper noun naming a specific programming language, it is treated as an uncountable noun. You would not refer to multiple javascripts; instead, you would refer to javascript code, scripts, or implementations to quantify the usage of the language.