Spread

> var obj1 = { name: 'kyi' }
undefined
> var obj2 = undefined
undefined
> var obj3 = null
undefined
> var result = { data: 'data', ... obj1, ...obj2, ...obj3 }
undefined
> result
{ data: 'data', name: 'kyi' }
> result = {...result, data: 'new' }
{ data: 'new', name: 'kyi' }