[bug] array.length is not supported

[Colindeng]

- var lessons = ["jade","js"]
if lessons
    if lessons.length>2
        p more than 2: #{lessons.join(',')}
    else if lessons.length >1
        p more than 1: #{lessons.join(',')}
    else
        p no1 lessons:#{lessons.length}
else
    p no2 lessons

---

output
no1 lessons:

[chbloemer]

currently only jexl syntax is supported. which is similar to javascript. in a future version you may have the possibility to switch to nashorn or graalvm. but thats currently very experimental and much slower than jexl.