remove duplicates

by aninaslyan

JavaScript

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

let unique = [...new Set(names)];
console.log(unique);



const names1 = ['John', 'Paul', 'George', 'Ringo', 'John'];

let x = (names1) => names1.filter((v,i) => names1.indexOf(v) === i)
x(names1);



const names3 = ['John', 'Paul', 'George', 'Ringo', 'John'];

function removeDups(names) {
  let unique = {};
  names.forEach(function(i) {
    if(!unique[i]) {
      unique[i] = true;
    }
  });
  return Object.keys(unique);
}

removeDups(names3);