JavaScript unshift function is used to add value in the beginning of the provided array. we have an array: var arr = [2,5]; arr.unshift(0); will add 0 in the beginning of the array. the final array will be [0, 2,5]. See the code snippet:
<!DOCTYPE html>
<html>
<head>
<title>Welcome to LearnKode - A code learning platform</title>
</head>
<body>
<button onclick="addElement()">Add element</button>
<p id="sample"></p>
<script>
var arr = [2,5];
document.getElementById("sample").innerHTML = arr ;
function addElement() {
arr.unshift(0);
document.getElementById("sample").innerHTML = arr ;
}
</script>
</body>
</html>
