Java Nashorn and ECMAScript 6 for..of : ECMAScript Exception: SyntaxError: Expected ; but found of

Question

The for..of syntax has been introduced in ES6.

It's supposed to be supported since JDK9 as part of JEP 292.

However, when I run OpenJDK 10's jjs, I get an exception:

jjs> for (var foo of ['bar', 'baz']) { print(foo); }
ECMAScript Exception: SyntaxError: <shell>:1:13 Expected ; but found of
for (var foo of ['bar', 'baz']) { print(foo); }
             ^

pyb · Accepted Answer · 2018-09-28 19:44:41Z

2

By default jjs supports ECMAScript 5, this can be fixed by running jjs with the flag --language=es6 at least with Java 9.

edited Sep 28, 2018 at 19:44

answered Sep 27, 2018 at 15:48

pyb

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2 Comments

Jörg W Mittag Over a year ago

Nice example of a self-answer. You could improve this, by adding a link to the documentation (if it exists), or an explanation how you figured this out, in case someone runs into a similar but not identical problem.

pyb Over a year ago

@JörgWMittag Good idea, done! I wanted to provide in my question the exact versions I was running and went to check jjs' documentation. That's where I found my answer :)

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