Class that I proud of

MoveLayer.js

/*
 * MoveLayer (ES6 class)
 * Move array item up and down
*/

class MoveLayer{
  
    static to(direction ='up',data = { items:[] , activeIndex:0}){
      if(data.activeIndex >= data.items.length-1 || data.activeIndex <= 0 || !Array.isArray(data.items))
      {
        return Array.isArray(data.items)?[...data.items]:[]
      }
      else{
      switch(direction)
      {
        case 'up':
          return [
            ...data.items.slice(0,data.activeIndex),
            data.items[data.activeIndex+1],
            data.items[data.activeIndex],
            ...data.items.slice(data.activeIndex+2)
          ]
        case 'down':
          return [
            ...data.items.slice(0,data.activeIndex-1),
            data.items[data.activeIndex],
            data.items[data.activeIndex-1],
            ...data.items.slice(data.activeIndex+1)
          ]
      }
     }
    }
    
}

/*
* Using Class Move Layer
*/
const items = [0,1,2,3,4,5,6,7,8,9]
const data = {items:items, activeIndex:2 }
console.log(Array.isArray(items))
const newItems = MoveLayer.to('up', data)
console.log(newItems)
const newItems2 = MoveLayer.to('down',data)
console.log(newItems2)