How to get the difference between two arrays of objects in JavaScript

Question

I have two result sets like this:

// Result 1
[
    { value: \"0\", display: \"Jamsheer\" },
    { value: \"1\", display: \"Muhammed\" },
    { value: \"2\",         


        

Answer 1

I came across this question while searching for a way to pick out the first item in one array that does not match any of the values in another array and managed to sort it out eventually with array.find() and array.filter() like this

var carList= ['mercedes', 'lamborghini', 'bmw', 'honda', 'chrysler'];
var declinedOptions = ['mercedes', 'lamborghini'];

const nextOption = carList.find(car=>{
    const duplicate = declinedOptions.filter(declined=> {
      return declined === car
    })
    console.log('duplicate:',duplicate) //should list out each declined option
    if(duplicate.length === 0){//if theres no duplicate, thats the nextOption
      return car
    }
})

console.log('nextOption:', nextOption);
//expected outputs
//duplicate: mercedes
//duplicate: lamborghini
//duplicate: []
//nextOption: bmw

if you need to keep fetching an updated list before cross-checking for the next best option this should work well enough :)