JAVASCRIPT

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 ]

javascript remove duplicate in two arrays

array1 = array1.filter(function(val) {
  return array2.indexOf(val) == -1;
});
// Or, with the availability of ES6:

array1 = array1.filter(val => !array2.includes(val));

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

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;
})

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']

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)

filter duplicates multidimensional array 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);

compare two arrays and remove duplicates javascript

array1 = array1.filter(function(val) {
  return array2.indexOf(val) == -1;
});

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']

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)

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)