Slice Object

sliceObject.js

const myObj = {
  key1: 10,
  key2: 11,
  key3: 12
}

const log = console.log

const sliceObject = ( obj, start = 0, end = ( Object.keys(obj).length) ) => {
  return Object
  .keys(obj)
  .slice(start, end)
  .reduce((acc, el) => {
    acc[el] = obj[el]
    return acc
  }, {})
}

log(
  sliceObject(myObj,0),
  sliceObject(myObj,2),
  sliceObject(myObj,0,1),
  sliceObject(myObj,1,2)
)