June 24, 2020

How to Perform Case-insensitive Sorting of Array in JavaScript

By Krishnaa JavaScript Questions 0 Comments

In this video tutorial, you will learn how to perform case-insensitive sorting of array in JavaScript

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="style.css">
  <title>Document</title>
</head>
<body>
  
  <div>
    <button id="btnAsc">Ascending</button>
    <button id="btnDesc">Descending</button>
    <ul></ul>
  </div>
  <script src="script.js"></script>
</body>
</html>

<!DOCTYPE html>

<head>

<title>Document</title>

</head>

<body>

<div>

<button id="btnAsc">Ascending</button>

<button id="btnDesc">Descending</button>

</div>

</body>

</html>

CSS:

div {
    width: 15%;
    margin: auto;
}

button {
    padding: 10px;
}

li {
    font-size: 20px;
    font-weight: bold;
    margin-left: -30px;
    list-style: none;
}

div {

width: 15%;

margin: auto;

}

button {

padding: 10px;

}

li {

font-size: 20px;

font-weight: bold;

margin-left: -30px;

list-style: none;

}

Javascript:

let users = ['Peter', 'Marks', 'cathy', 'James', 'Sam'];

function addUsers(){
    let template = users.map(user => `<li>${user}</li>`).join('\n');
    document.querySelector('ul').innerHTML = template;
}

addUsers();

let btnAsc = document.querySelector('#btnAsc');
let btnDesc = document.querySelector('#btnDesc');

btnAsc.addEventListener('click', () => {
    users.sort((a,b) => a.toLowerCase().localeCompare(b.toLowerCase()));
    addUsers();
});

btnDesc.addEventListener('click', () => {
    users.sort((a,b) => a.toLowerCase().localeCompare(b.toLowerCase()));
    users.reverse();
    addUsers();
});