let array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96];
let lengths = [3, 6];
let batches = lengths.map(() => []);
for (let i = 0; array.length; i = 1 - i)
batches[i] = batches[i].concat(array.splice(0, lengths[i]));
console.log(batches);
// let [new_data1, new_data2] = batches;
Кстати, ваш пример вывода отключен на 1. 18
должно быть в new_data1
, а не new_data2
. Точно так же 21
должен перейти на new_data2