Java Requires Chilkat v11.4.0+

Eval JavaScript Returning Int

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Demonstrates getting the completion value of a JavaScript that returns an integer. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Js;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example demonstrates getting the completion value of a script,
        // where the last evaluated expression is an integer.

        // The Javascript run in this example is shown below.

        // Load the JavaScript from a file.
        StringBuilder sbScript = new StringBuilder();
        try {
            sbScript.loadFile("js_eval_return_int.js", "utf-8");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Js js = new Js();
        JsonObject result = new JsonObject();

        // Run the JavaScript
        // Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
        // In this case, the last evaluated expression is an int.
        try {
            js.eval(sbScript, result);
        } catch (ChilkatException e) {
            System.out.println(sbScript.getLastErrorText());
            return;
        }

        result.setEmitCompact(false);
        System.out.println(result.emit());

        // Output:

        // {
        //   "type": "int",
        //   "value": 42
        // }
    }
}

JavaScript

const base = 10;
const multiplier = 4;
const offset = 2;

// The last line is a calculation resulting in an integer
// Returns 42.
(base * multiplier) + offset;