removing duplicates from array javascript

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

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

View another examples Add Own solution

4.11

Sharptooth 90 points

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

Thank you! 6

4.11 (9 Votes)

3.83

Amanda thompson 75 points

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

let x = (names) =&gt; names.filter((v,i) =&gt; names.indexOf(v) === i)
x(names); // 'John', 'Paul', 'George', 'Ringo'

Thank you! 6

3.83 (6 Votes)

4.67

Ana Claudia 110 points

                                    let a = [10,20,30,50,30];
let b = a.reduce((unique,item) =&gt; unique.includes(item) ? unique: [... unique, item] ,[]); 
console.log(b);

Thank you! 9

4.67 (9 Votes)

4.1

Azizul Karim 85 points

                                    // 1. filter()
function removeDuplicates(array) {
  return array.filter((a, b) =&gt; array.indexOf(a) === b)
};
// 2. forEach()
function removeDuplicates(array) {
  let x = {};
  array.forEach(function(i) {
    if(!x[i]) {
      x[i] = true
    }
  })
  return Object.keys(x)
};
// 3. Set
function removeDuplicates(array) {
  array.splice(0, array.length, ...(new Set(array)))
};
// 4. map()
function removeDuplicates(array) {
  let a = []
  array.map(x =&gt; 
    if(!a.includes(x) {
      a.push(x)
    })
  return a
};
/THIS SITE/ &quot;https://dev.to/mshin1995/back-to-basics-removing-duplicates-from-an-array-55he#comments&quot;

Thank you! 10

4.1 (10 Votes)

Jay Cossey 85 points

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

Thank you! 3

4 (3 Votes)

Are there any code examples left?

Find Add Code snippet

New code examples in category Javascript

Javascript 2023-04-21 22:52:36
Javascript 2022-03-27 22:25:20 javascript download string as file
Javascript 2022-03-27 21:40:22 sort numbers in array javascript
Javascript 2022-03-27 21:20:04 compare two arrays and return the difference javascript
Javascript 2022-03-27 21:15:02 javascript regex french phone number
Javascript 2022-03-27 21:05:03 cypress custom error message
Javascript 2022-03-27 21:00:05 create element javascript with id
Javascript 2022-03-27 20:40:57 feather icons react
Javascript 2022-03-27 20:20:01 how to make graphql request in axios
Javascript 2022-03-27 20:15:07 bootstrap validator password and confirm password

Create a Free Account

Unlock the power of data and AI by diving into Python, ChatGPT, SQL, Power BI, and beyond.

Develop soft skills on BrainApps

Complete the IQ Test

Relative searches

removing duplicates from array javascript

Welcome Back!

Create a Free Account