How to Check if Variable is Array in Javascript | Collection of Helpful Guides & Tutorials!

<!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>Check</button>
        <h1>Result</h1>
    </div>
    
    <script src="script.js"></script>
</body>
</html>

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<!DOCTYPE html>

<head>

<title>Document</title>

</head>

<body>

<div>

<button>Check</button>

<h1>Result</h1>

</div>

</body>

</html>

body {
    text-align: center;
}

div {
    display: inline-block;
}

button {
    display: inline-block;
    padding: 10px 20px;
}

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body {

text-align: center;

}

div {

display: inline-block;

}

button {

display: inline-block;

padding: 10px 20px;

}

let btnCheck = document.querySelector('button');
let result = document.querySelector('h1');

let user = ['Peter'];

btnCheck.addEventListener('click', () => {
    result.innerText = Array.isArray(user) ? 'True' : 'False';
});

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let btnCheck = document.querySelector('button');

let result = document.querySelector('h1');

let user = ['Peter'];

btnCheck.addEventListener('click', () => {