JAVASCRIPT

js delete duplicates from array

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

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

removing duplicates in array javascript

let arr = [1,2,3,1,1,1,4,5]
    
let filtered = arr.filter((item,index) => arr.indexOf(item) === index)
    
 console.log(filtered) // [1,2,3,4,5]

javascript remove duplicates

var arr = ["apple", "mango", "apple", "orange", "mango", "mango"];
  
function removeDuplicates(arr) {
	return arr.filter((item, 
		index) => arr.indexOf(item) === index);
}
  
console.log(removeDuplicates(arr)); // ["apple", "mango", "orange"]

how to remove duplicates from array in javascript

// 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 ]

filter duplicates from array javascript

// usage example:
var myArray = ['a', 1, 'a', 2, '1'];
var unique = myArray.filter((v, i, a) => a.indexOf(v) === i);

console.log(unique); // unique is ['a', 1, 2, '1']
 Run code snippet

javascript remove duplicated from Array

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 ]

javascript compare arrays remove duplicates

var arr1 = [1, 2, 3, 4, 5];
var arr2 = [1, 3, 5, 7, 9];


arr2 = arr2.reduce(function (prev, value) {

    var isDuplicate = false;
    for (var i = 0; i < arr1.length; i++) {
        if (value == arr1[i]) {
            isDuplicate = true;
            break;
        }
    }
      
    if (!isDuplicate) {
        prev.push(value);
    }
       
    return prev;
        
}, []);


alert(JSON.stringify(arr2));
 Run code snippet

duplicates array js

let arr = [1, 2, 3, 4, 3, 3, 3]

console.log([...new Set(arr)])
// (4) [1, 2, 3, 4]

let arr = [1, 2, 3, 4, 3, 3, 3, 'foo', true]

console.log([...new Set(arr)])
//(6) [1, 2, 3, 4, 'foo', true]

remove duplicates from array js

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

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

console.log(uniqueArray);

javascript to remove duplicates from an array

uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos; 
})

javascript remove duplicates from array

var myArr = [1, 2, 2, 2, 3];
var mySet = new Set(myArr);
myArr = [...mySet];
console.log(myArr);
// 1, 2, 3

javascript remove duplicates from array

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

how to remove duplicates in array in javascript

const numbers = [1 , 21, 21, 34 ,12 ,34 ,12];
const removeRepeatNumbers = array => [... new Set(array)]
removeRepeatNumbers(numbers) // [ 1, 21, 34, 12 ]

javascript remove duplicates from array

// for TypeScript and JavaScript
const initialArray = ['a', 'a', 'b',]
finalArray = Array.from(new Set(initialArray)); // a, b

javascript to remove duplicates from an array

uniqueArray = a.filter(function(item, pos) {
    return a.indexOf(item) == pos;
})

how to remove duplicates in js array

let arr = [1, 2, 3, 4, 3, 3, 3]

console.log([...new Set(arr)])
// (4) [1, 2, 3, 4]

let arr = [1, 2, 3, 4, 3, 3, 3, 'foo', true]

console.log([...new Set(arr)])
//(6) [1, 2, 3, 4, 'foo', true]

remove duplicates from array javascript

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']

array without duplicates js

const Array = [0, 3, 2, 5, 6, 8, 23, 9, 4, 2, 1, 2, 9, 6, 4, 1, 7, -1, -5, 23, 6, 2, 35, 6,
  3, 32, 9, 4, 2, 1, 2, 9, 6, 4, 1, 7, 1, 2, 9, 6, 4, 1, 7, -1, -5, 23]

// 1. filter
Array.filter((item, index) => {
  return arr.indexOf(item) === index;
});

// 2. set
const newArray = [...new Set(Array)]
console.log(newArray)
// OR //
const newArray = Array.from(new Set(arr))
console.log(newArray)

// 3. reduce
Array.reduce((unique, item) => {
  if (unique.includes(item)) {
    return unique;
  } else return [...unique, item], [];
});

Remove Duplicates array values in javascript

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]

js delete duplicates from array

const names = ['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(names); // // 'John', 'Paul', 'George', 'Ringo'

Javascript removing duplicates in array

const array = [1, 1, 2, 3, 5, 5, 1]
const uniqueArray = [...new Set(array)];

console.log(uniqueArray); // Output: [1, 2, 3, 5]

javascript remove duplicates

uniq = [...new Set(array)];

remove duplicate elements array javascript

let b = [];
for (i = 0; i < 5; i++){
a = prompt("Enter Name: ");
let d = b.push(a);
}
c = [...new Set(b)]
console.log(c)

how to delete duplicate elements in an array in javascript

//Other Mathod using Foreach and includes
let chars = ['A', 'B', 'A', 'C', 'B'];

let uniqueChars = [];
chars.forEach((c) => {
    if (!uniqueChars.includes(c)) {
        uniqueChars.push(c);
    }
});

console.log(uniqueChars);

filter duplicates javascript

var arr = [[7,3], [7,3], [3,8], [7,3], [7,3], [1,2]];

arr.map(JSON.stringify).reverse().filter((e, i, a) => a.indexOf(e, i+1) === -1).reverse().map(JSON.parse) // [[7,3], [3,8], [1,2]]

remove duplicates in an Array in Javascript

let chars = ['A', 'B', 'A', 'C', 'B'];
let uniqueChars = [...new Set(chars)];

console.log(uniqueChars);

remove duplicates in array js, array js

const removeDuplicates = (arr) => [...new Set(arr)];
const arr = [1, 2, 3, 4, 5, 3, 1, 2, 5];
const distinct = removeDuplicates(arr);
console.log(distinct); // [1, 2, 3, 4, 5]

JavaScript remove duplicate items

function onlyUnique(value, index, self) {
  return self.indexOf(value) === index;
}

// usage example:
let a = ['a', 1, 'a', 2, '1'];
let unique = a.filter(onlyUnique);

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

prevent duplicate entries in javascript array

if (array.indexOf(value) === -1) array.push(value);

remove duplicates from array javascript

[...new Set(array)]

remove duplicates from array javascript

arr.filter((v,i,a)=>a.findIndex(t=>(t.place === v.place && t.name===v.name))===i)

remove duplicates javascript

function withoutDuplicates (arr) {
  return [...new Set(arr)];
}

removing duplicates from array javascript

var names = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"];
var uniqueNames = [];
$.each(names, function(i, el){
    if($.inArray(el, uniqueNames) === -1) uniqueNames.push(el);
});

how to remove duplicate values in array javascript

var car = ["Saab","Volvo","BMW","Saab","BMW",];
var cars = [...new Set(car)]
document.getElementById("demo").innerHTML = cars;

javascript remove duplicates from array

let chars = ['A', 'B', 'A', 'C', 'B'];
let uniqueChars = [...new Set(chars)];

console.log(uniqueChars);
Code language: JavaScript (javascript)

how to remove duplicates in js

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

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

remove duplicate item from array javascript

function remove_duplicates(arr) {
    var obj = {};
    var ret_arr = [];
    for (var i = 0; i < arr.length; i++) {
        obj[arr[i]] = true;
    }
    for (var key in obj) {
        ret_arr.push(key);
    }
    return ret_arr;
}