const allNames = ['Nathan', 'Clara ', 'Nathan', 'Fowler', 'Mitchell', 'Fowler', 'Clara ', 'Drake', 'Fowler', 'Clyde ', 'Mitchell', 'Clyde '];

​

function checkName(names) {

  const uniqueName = [];

  for (let i = 0; i < names.length; i++) {

    const nameIndex = names[i];

    if (uniqueName.includes(nameIndex) == false) {

      uniqueName.push(nameIndex);

    }

  }

  return uniqueName;

}

​

const uniqueNames = checkName(allNames);

console.log(uniqueNames);

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

​

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

console.log(unique); // 'John', 'Paul', 'George', 'Ringo'

// how to remove duplicates from array in javascript

// 1. filter()

let num = [1, 2, 3, 3, 4, 4, 5, 5, 6];

let filtered = num.filter((a, b) => num.indexOf(a) === b)

console.log(filtered);

// Result: [ 1, 2, 3, 4, 5, 6 ]

​

// 2. Set()

const removeDuplicates = (arr) => [...new Set(arr)];

console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));

// Result: [ 1, 2, 3, 4, 5, 6 ]

const array  = [5,4,7,8,9,2,7,5];

array.filter((item,idx,arr) => arr.indexOf(item) === idx);

// or

const nonUnique = [...new Set(array)];

// Output: [5, 4, 7, 8, 9, 2]

const myArray = [2,5,6,2,2,4,5,3,3];

​

const uniqueArray = [...new Set(myArray)];

​

console.log(uniqueArray);

// for TypeScript and JavaScript

const initialArray = ['a', 'a', 'b',]

finalArray = Array.from(new Set(initialArray)); // a, b

uniqueArray = a.filter(function(item, pos) {

    return a.indexOf(item) == pos; 

})

​

var myArr = [1, 2, 2, 2, 3];

var mySet = new Set(myArr);

myArr = [...mySet];

console.log(myArr);

// 1, 2, 3

unique = [...new Set(arr)];   // where arr contains duplicate elements

uniqueArray = a.filter(function(item, pos) {

    return a.indexOf(item) == pos;

})

​

function onlyUnique(value, index, self) {

  return self.indexOf(value) === index;

}

​

// usage example:

var a = ['a', 1, 'a', 2, '1'];

var unique = a.filter(onlyUnique);

​

console.log(unique); // ['a', 1, 2, '1']