如何将我的数组分成 discord.js 中的一些部分？

Question

I'm doing pagination in an embed and I wanted to split 4 elements from an array for each page. How do I do this? (to update when I click the button). Until then I have only the first step which is to get the first 4 elements, from the first page, with:

.slice(0, 4)

How do I get the next 4, and the next, and so on...

Answer 1

you need to define:

• currentPage variable (set to 1 as default value)
• pageSize - how many items should be for one page
• countPages - for calculation, rounded in bigger side

I have written 3 methods

• loadFirstPage()
• loadNextPage()
• loadPrevPage()

 const input = [1,2,3,4,5,6,7,8,9,10,11,12,13]; let currentPage = 1; let pageSize = 4; const countPages = Math.ceil(input.length / pageSize); function loadFirstPage() { currentPage = 1; return [...input].splice(0, pageSize) } function loadNextPage() { const nextPage = currentPage + 1; if (nextPage <= countPages) { currentPage = nextPage; const startIndex = currentPage * pageSize - pageSize; return [...input].splice(startIndex, pageSize) } else { currentPage = countPages; const startIndex = currentPage * pageSize - pageSize; return [...input].splice(startIndex, pageSize) } } function loadPrevPage() { const prevPage = currentPage - 1; if (prevPage >= 1) { currentPage = prevPage; const startIndex = currentPage * pageSize - pageSize; return [...input].splice(startIndex, pageSize) } else { currentPage = 1; const startIndex = currentPage * pageSize - pageSize; return [...input].splice(startIndex, pageSize) } } console.log('output data: ', loadFirstPage(), 'current page: ', currentPage); console.log('output data: ', loadNextPage(), 'current page: ', currentPage); console.log('output data: ', loadNextPage(), 'current page: ', currentPage); console.log('output data: ', loadNextPage(), 'current page: ', currentPage); console.log('output data: ', loadNextPage(), 'current page: ', currentPage); console.log('output data: ', loadPrevPage(), 'current page: ', currentPage); console.log('output data: ', loadPrevPage(), 'current page: ', currentPage); console.log('output data: ', loadPrevPage(), 'current page: ', currentPage); console.log('output data: ', loadPrevPage(), 'current page: ', currentPage);