A basic paginator written in Typescript. This is usefull when the backend does not support pagination, but you still need some sort of pagination functionality.

simple-paginator.ts

export interface Page<T> {
  items: T[]
  index: number
  total_pages: number
  page_size: number
  current_page: number
}


export const getPage = <T>(list: T[], page_index: number, page_size: number): Page<T> => {
  let imList = List(list)
  let res = imList.skip(page_index * page_size).take(page_size).toArray()
  //let res = list.splice(page_index * page_size).slice(0, page_size) // When immutable js is not available

  let total_items = list.length
  let total_pages = Math.ceil(total_items / page_size)
  if (total_items < page_size) total_pages = 1

  return ({ index: page_index, items: res, total_pages: total_pages, current_page: page_index, page_size: page_size })
}

This code snippet has dependency on immutable.js in order to make skip and take work.