John Au-YeungTo move to prev/next element of an array with JavaScript, we can define our own array class.
For instance, we write
class TraversableArray extends Array {
next() {
return this[++this.current];
}
}
to define the TraversableArray class that extends the Array class.
In it, we add the next method that returns the object at the current index after incrementing it by 1.
