JSScript

public final class JSScript<T> : JSExpression where T : Decodable

A JavaScript expression that executes a user-defined script. This class allows you to evaluate your own custom scripts.

For instance, to return the text of the longest

node in the current document:

 let javaScript = """
 var longestInnerHTML = "";
 var pTags = document.getElementsByTagName("p");

 for (var i = 0; i < pTags.length; i++) {
     var innerHTML = pTags[i].innerHTML;

     if (innerHTML.length > longestInnerHTML.length) {
         longestInnerHTML = innerHTML;
     }
 }

 longestInnerHTML;
 """

 let findLongestText = JSScript<String>(javaScript)
 // this is equivalent to running the script inside a browser's JavaScript console.

Instances of this class are specialized with the T generic parameter. It must be set to the type of the last statement in your script. In the above example, findLongestText has a return type of String because its last statement is a String (longestInnerHTML).

T must be a Decodable type. This includes:

• JSVoid for scripts that do not return a value
• Primitive values (Strings, Numbers, Booleans, …)
• Decodable enumerations
• Objects decodable from JSON
• Arrays of primitive values
• Arrays of enumeration cases
• Arrays of objects
• Native dictionaries