The self-invoking function in JavaScript are known as Immediately Invoked Function Expressions (IIFE). Immediately Invoked Function Expressions (IIFE) is a JavaScript function that executes immediately after it has been defined so there is no need to manually invoke IIFE.
Following is the code for self-invoking function (IIFE) in JavaScript −
Example
<!DOCTYPE html>
<html lang="javascript:void(0);en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.sample {
font-size: 18px;
font-weight: 500;
}
</style>
</head>
<body>
<h1>JavaScript Immediately Invoked Function Expressions (IIFE)</h1>
<div class="sample"></div>
<script>
let sampleEle = document.querySelector(".sample");
(function () {
sampleEle.innerHTML = "This code is invoked immediately as soon as it is defined";
})();
</script>
</body>
</html>Output
The above code will produce the following output −
