remove duplicate array es6

1const names = ['John', 'Paul', 'George', 'Ringo', 'John'];
2
3let unique = [...new Set(names)];
4console.log(unique); // 'John', 'Paul', 'George', 'Ringo'

1const names = ['John', 'Paul', 'George', 'Ringo', 'John'];
2
3function removeDups(names) {
4  let unique = {};
5  names.forEach(function(i) {
6    if(!unique[i]) {
7      unique[i] = true;
8    }
9  });
10  return Object.keys(unique);
11}
12
13removeDups(names); // // 'John', 'Paul', 'George', 'Ringo'

1let a = [10,20,30,10,30];
2let b = a.filter((item,index) => a.indexOf(item) === index);
3console.log(b); 

1// Using the Set constructor and the spread syntax:
2
3arrayWithOnlyUniques = [...new Set(arrayWithDuplicates)]

1let a = [10,20,30,10,30];
2let b = [... new Set(a)];
3console.log(b);

1let a = [10,20,30,50,30];
2let b = a.reduce((unique,item) => unique.includes(item) ? unique: [... unique, item] ,[]); 
3console.log(b);