The javascript file contains a method addToViewer (theUrl), I need to get the variable 'url' from the servlet into this method.

Data Types Since JavaScript is dynamically-typed you don't have to declare function or variable types. JavaScript engines just figure it out. Java, on the other hand, is a statically-typed language.

What you need to know about variable scope What is a user-defined variable in JavaScript? All JavaScript programming happens in an environment like a web browser, Node, or Bun.js.