Classes in Wren

ClassInWren.wren

class Counter {
    construct new(withValue) {
       _currentValue = withValue
    }
    increment() {
       _currentValue = _currentValue + 1
    }
    value { _currentValue }
}

var c = Counter.new(0)
for (v in in 1...10.where{|e| e % 2 == 0) {
    System.print("%(v)")
    c.increment()
    System.print("%(c.value)")
}
for (e in ["hello", "world"]) {
    System.print("%(e)")
}