javascript to remove duplicates from an array

const names = ['John', 'Paul', 'George', 'Ringo', 'John'];

let unique = [...new Set(names)];
console.log(unique); // 'John', 'Paul', 'George', 'Ringo'unique = [...new Set(arr)];   // where arr contains duplicate elementsuniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos; 
})
arr.filter((v,i,a)=>a.findIndex(t=>(t.place === v.place && t.name===v.name))===i)uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})