How To Find Duplicate Values In Array Of Objects Using JavaScript
Last Updated : Mar 11, 2024
IN - JavaScript | Written & Updated By - Anjali
In this article we will show you the solution of how to find duplicate values in array of objects using JavaScript, an array is a finite collection of homogenous elements.
If any array contains duplicate values, we can find and remove them by using JavaScript. In this tutorial, we are going to use for loop to find duplicate elements.
Step By Step Guide On How To Find Duplicate Values In Array Of Objects Using JavaScript :-
In this method, we are going to use the for loop. Let us see the code first.
<!DOCTYPE html>
<html lang = " en " >
<head>
<meta charset = " UTF - 8" >
<meta http-equiv = " X-UA-Compatible " content = " IE=edge " >
<meta name = " viewport " content = " width = device-width , initial-scale = 1.0 " >
<title> how to find duplicate values in array of objects using JavaScript </title>
<style>
body {
font-family : 'Lucida Sans' , 'Lucida Sans Regular' , 'Lucida Grande' , 'Lucida Sans Unicode' , Geneva , Verdana , sans-serif ;
}
h1 {
font-size : larger ;
font-weight : bolder ;
color : rgb(113, 221, 113) ;
text-align : center ;
}
h3 {
text-align : center ;
}
</style>
</head>
<body>
<h1> TALKERSCODE </h1>
<h3> how to find duplicate values in array of objects using JavaScript </h3>
<script>
var names = [ "peter" , "thomas" , "steve" , "mark" , "emily" , "steve" , "thomas" ]
var duplicates = []
var temp_names = [...names].sort()
for(var i = 0; i<temp_names.length; i++){
if (temp_names [ i ] == temp_names [ i+1 ]){
if(!duplicates.includes(temp_names [ i ])){
duplicates.push (temp_names[ i ])
}
}
console.log( duplicates )
}
</body>
</html>
- First, we write <! DOCTYPE html> which we used as an instruction to the web browser about what version of HTML file is written in.
- Secondly, the <html> tag is used to indicate the beginning of an HTML document.
- As above now the <head> tag is used to contain information about the web page. In this tag, a <title> tag is used which helps us to specify a webpage title.
- Both <head> and <title> tags are Paired tags. So, both have </head> and </title> ending tags respectively.
- Thirdly, the <body> tag is used to define the webpage body. All the contents to show on the website are written here.
- <h1> tag used to add heading here.
- Created the <style> tag to add CSS to the HTML page.
- To add JavaScript Create a <script> tag.
- At first we have to create an array with values. Also, create a duplicate array that will have duplicate values in the array.
- Then by using the sort() method, sort the array and store it in the temporary array.
- Now create a for loop. Add two if statement into it that, if the index value is equal to the next value then push it to the duplicate array.
- Using console.log() to display the array containing the duplicate values.
Conclusion :-
At last, here in conclusion, here we can say that with this article’s help, we know how to find duplicate values in an array of objects using JavaScript.
I hope this article on how to find duplicate values in array of objects using JavaScript helps you and the steps and method mentioned above are easy to follow and implement.
About Anjali
