Filter distinct objects by property from array

// creates an object only once - garbage be glad ^^
let cachedObject = {};

// array to be filtered
let arr = [
    {id : 0, prop : 'blah'},
    {id : 1, prop : 'foo'},
    {id : 0, prop : 'bar'}
]

// "filter" to object - keep original array - garbage be glad too ^^
arr.map((item)=> cachedObject[item.id] = item)

// optional, turns object to array
arr = Object.values(cachedObject)