exposevar.js

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// Example showing how to expose a script global var from caller

var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");
// create manager
var manager = new ScriptEngineManager();
// create engine
var engine = manager.getEngineByName("js");

// expose variable to engine
engine.put("name", "Nashorn");

// access it from script
engine.eval("print('Hello, ' + name)");