How to use

PolyglotEngineWithJavaScript$Multiplier

in

com.oracle.truffle.tck.impl

public void callJavaScriptFunctionFromJava() {
  Source src = Source.newBuilder("js",
    "(function (a, b) {\n" +
    "  return a * b;\n" +
    "})\n",
    "mul.js").buildLiteral();
  // Evaluate JavaScript function definition
  Value jsFunction = context.eval(src);
  // Create Java access to JavaScript function
  Multiplier mul = jsFunction.as(Multiplier.class);
  assertEquals(42, mul.multiply(6, 7));
  assertEquals(144, mul.multiply(12, 12));
  assertEquals(256, mul.multiply(32, 8));
}
// END: com.oracle.truffle.tck.impl.PolyglotEngineWithJavaScript#callJavaScriptFunctionFromJava

public void callJavaScriptFunctionFromJava() {
  Source src = Source.newBuilder("js",
    "(function (a, b) {\n" +
    "  return a * b;\n" +
    "})\n",
    "mul.js").buildLiteral();
  // Evaluate JavaScript function definition
  Value jsFunction = context.eval(src);
  // Create Java access to JavaScript function
  Multiplier mul = jsFunction.as(Multiplier.class);
  assertEquals(42, mul.multiply(6, 7));
  assertEquals(144, mul.multiply(12, 12));
  assertEquals(256, mul.multiply(32, 8));
}
// END: com.oracle.truffle.tck.impl.PolyglotEngineWithJavaScript#callJavaScriptFunctionFromJava