pagination_example.js

const size = 5;
const list = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21];


const totalPage = Math.ceil(list.length / size);

const paginate = [];

list.map((item, index) => {
    const indexPage = Math.trunc(index / size);
    if (!paginate?.[indexPage]) {
        paginate[indexPage] = [item];
        return;
    }
    paginate[indexPage].push(item);
});

console.log(paginate);