object-lookup.js

getPage(action, currentPage) {
    let goToPage;
    let userQuery =  dom.getQueryFromPage()
    this.fetchData(lookupPage(action)(currentPage), userQuery)
    manipulateWindow.animateToTopOfPage()
  }

  lookupPage(goToPage) {
    let pages = {
      'prev': (page) {
        return page - 1
      },
      'next': (page) {
        return page + 1
      },
      'default': () {
        return 1
      }
    }
    return (pages[goToPage] || pages['default'])
  }

switch.js

 switch(action) {
  case "prev":
    goToPage = currentPage - 1
    console.log('in previous ', goToPage)
    userQuery ? this.fetchData(goToPage, userQuery) : this.fetchData(goToPage)
    break;
  case "next":
    gotToPage = currentPage + 1
    console.log('in next ', goToPage)
    userQuery ? this.fetchData(goToPage, userQuery) : this.fetchData(goToPage)
    break;
}