CODEWITHSUNDEEP
javascriptjavaarraysnashorn
Rahul Choubey
Rahul Choubey

Reputation: 41

Nashorn gives error with Array.from(string)

I have a javascript file fun.js

function fun1(){
    var str='apple';
    var charArray = Array.from(str);
    return charArray;
}

I return this charArray to my java code using nashorn. But nashorn gives exception as-

javax.script.ScriptException: TypeError: Array.from is not a function in at line number 25

How can I use Array.from() with nashorn or is there any way to convert string to charArray in js which is compatible with nashorn.

my java code is -

    System.out.println("intialising parser....");

    ScriptEngine engine= new ScriptEngineManager().getEngineByName("nashorn");

    engine.eval(new FileReader("index.js"));
    Invocable invocable= (Invocable) engine;

    Object obj = (Object)invocable.invokeFunction("fun1");

Upvotes: 1

Views: 958

Answers (2)

Rahul Choubey
Rahul Choubey

Reputation: 41

Later I found it was simple like this-

function fun1(){
var str='apple';
var charArray =str.split('');
return charArray;
}

Also it is compatible with nashorn.

Upvotes: 0

Elliott Frisch
Elliott Frisch

Reputation: 201447

There is, it is String.toCharArray(), because Nashorn allows you to use Java methods. So you can do,

System.out.println("initializing parser....");
String js = "function fun1() { return 'apple'.toCharArray() }";
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
try {
    engine.eval(js);
    Invocable invocable = (Invocable) engine;

    Object obj = (Object) invocable.invokeFunction("fun1");
    System.out.println(Arrays.toString((char[]) obj));
} catch (Exception e) {
    e.printStackTrace();
}

And that outputs

initializing parser....
[a, p, p, l, e]

Upvotes: 1

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