Private class properties, getters, iterators in one simple example
Ever needed to loop over a set of values continuously, i.e. return to the first value when the end is reached? You could use an array, increment the index and set it to 0 when the end is reached, or you could take the opportunity to learn some modern js features:
class Looper { #i // iterator #b // iterable e.g. array, Map, Set #v // value constructor(iterable) { this.#b = iterable this.reset() } get value() { return this.#v.value } get next() { this.#v = this.#i.next() if (this.#v.done) { this.reset() } return this.value } reset() { this.#i = this.#b[Symbol.iterator]() this.#v = this.#i.next() return this } } Example usage:
const loop = new Looper([1,2,3]) loop.value //1 loop.next //2 loop.next //3 loop.next //1 loop.next //2 loop.reset() loop.value //1 loop.next //2 loop.reset().value //1 loop.next //2 loop.next //3 :)
Top comments (0)