Array chunks

arrayChunks.js

let array = [1,2,3,4,5,6,7,8,9,10,11,12,13];
const arrayToChunks = (arr, chunkSize) => {
			let i,
				j,
				chunks = [];

			for (i = 0, j = arr.length; i < j; i += chunkSize) {
				chunks.push(arr.slice(i, i + chunkSize));
			}

			return chunks;
		};
Promise.all(
			// To be sent in groups of 1000
			arrayToChunks(array, 5).map(chunk => console.log(chunk)));