merge_arrays_1

merge_arrays_1.js

let allCars = cars.concat(cars2);
let unique = allCars.filter ( (item,index) => index === allCars.findIndex ( car => car.id === item.id) );

// RESULT IS:
[
 {id:1,make:"Ferrari",model:"812GTS",price:336000,colour:"rosso corsa"},
 {id:2,make:"Ferrari",model:"F8 Spider",price:262000,colour:"giallo modena"},
 {id:3,make:"Lamborghini",model:"Aventador S",price:329400,colour:"blu le mans"},
 {id:4,make:"Bugatti",model:"Chiron Pur Sport",price:3000000,colour:"blue"},
 {id:5,make:"McLaren",model:"New GT",price:203000,colour:"helios orange"},
 {id:6,make:"Ferrari",model:"F8 Spider",price:262000,colour:"giallo modena"},
 {id:7,make:"Ferrari",model:"F8 Spider",price:262000,colour:"red"},
 {id:8,make:"Bugatti",model:"Chiron Pur Sport",price:3000000,colour:"red"},
 {id:9,make:"Lamborghini",model:"Huracan",price:206790,colour:"green"},
 {id:10,make:"Bugatti",model:"Chiron Sport 110 ans",price:16000000,colour:"dark gray"}
]