To 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.
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