(Java) Eval JavaScript Returning Int

See more JavaScript Examples

Note: This example requires Chilkat v11.4.0 or greater.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // 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.
    CkStringBuilder sbScript = new CkStringBuilder();
    success = sbScript.LoadFile("js_eval_return_int.js","utf-8");
    if (success == false) {
        System.out.println(sbScript.lastErrorText());
        return;
        }

    CkJs js = new CkJs();
    CkJsonObject result = new CkJsonObject();

    // 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.
    success = js.Eval(sbScript,result);
    if (success == false) {
        System.out.println(sbScript.lastErrorText());
        return;
        }

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

    // Output:

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

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

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