Javascript async iterators to fetch data from paginated REST api.

asynciterators.js

async function pageRequest(params) {
    if (params.start >= 100) {
        return Promise.resolve({
            start: params.start,
            limit: 25,
            isEndOfData: true
        });
    } else {
        return Promise.resolve({
            start: params.start,
            limit: 25,
            isEndOfData: false
        });
    }
    
};

let pageIterator = {
    [Symbol.asyncIterator]: () => {
        return {
            offset: 0,
            finished: false,
            async next() {
                if (!this.finished) {
                    let response = await pageRequest({ start: this.offset });
                    this.finished = response.isEndOfData;
                    this.offset += response.limit;
                    return Promise.resolve({
                        value: response,
                        done: false
                    });
                } else {
                    this.offset = 0;
                    this.finished = false;
                    return Promise.resolve({
                        done: true
                    });
                }
            }
        }
    }
};


(async() => {
    for await (const item of pageIterator) {
        console.log(item);
    }
})();