Duplicate array value in javascript

Something Like that:
[]

Duplicate value in array
For example I want to write number like 2,5,8
[]

For that you need to create first html code.

HTML

<p id="demo"></p>

After that add this JS code.

JS

var arr1 = [1,2,5,8,10,2,8,5];
var sortarr1 = arr1.sort();
var newarr1 = [];

for(i=0; i<arr1.length; i++){
	if(sortarr1[i] == sortarr1[i + 1]){
		newarr1.push(sortarr1[i]);
	}
}

document.getElementById("demo").innerHTML = newarr1;

[codepen_embed height=”265″ theme_id=”0″ slug_hash=”zdvpPL” default_tab=”result” user=”pradeepanvi”]See the Pen Duplicate array value in javascript by Pradeep Kumar (@pradeepanvi) on CodePen.[/codepen_embed]

Now you can see

2,5,8