const directions = ["North", "West", "South", "East"];
I want directions.next(); to cycle through them in order. How do I accomplish that in the latest iteration of the ECMAScript? I want every function that calls for directions to get what .next() established to be next.
Does it need to be its own mini-data structure?
Here's what I want to accomplish:
`["Jason Bourne", "Foma Kinaev", "John Michael Kane"]`.next() # // Jason Bourne
`["Jason Bourne", "Foma Kinaev", "John Michael Kane"]`.next() # // Foma Kinaev
`["Jason Bourne", "Foma Kinaev", "John Michael Kane"]`.next() # // John Michael Kane
`["Jason Bourne", "Foma Kinaev", "John Michael Kane"]`.next() # // Jason Bourne
You could use a generator function to yield the values of your array continuously in a while loop (to enabled circular iteration). Then use the generator to give you an iterator that you can then call .next() on to grab the value:
const directions = ["North", "West", "South", "East"];
function* getItr(arr) {
while(true) yield* arr;
}
const itr = getItr(directions);
console.log(itr.next().value); // North
console.log(itr.next().value); // West
console.log(itr.next().value); // South
console.log(itr.next().value); // East
console.log(itr.next().value); // NorthJavaScript arrays don't maintain any iteration state so you'd need to handle some form of internal index pointer yourself
const directions = ["North", "West", "South", "East"];
Array.prototype._current = 0
Array.prototype.next = function() {
const cur = this[this._current]
this._current = (this._current + 1) % this.length
return cur
}
console.log(directions.next())
console.log(directions.next())
console.log(directions.next())
console.log(directions.next())
console.log(directions.next())