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Implement Private properties using closures in JavaScript
Following is the code to implement private properties using closures in JavaScript −
Example
<!DOCTYPE html>
<html lang="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;
}
.result {
font-size: 20px;
font-weight: 500;
color: blueviolet;
}
</style>
</head>
<body>
<h1>Private properties, using closures</h1>
<div class="result">0</div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to increment the above counter using closures</h3>
<script>
let BtnEle = document.querySelector(".Btn");
let resEle = document.querySelector(".result");
function test() {
let a = 0;
return function incrementA() {
a++;
return a;
};
}
let storeVal = test();
BtnEle.addEventListener("click", (event) => {
resEle.innerHTML = storeVal();
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button the counter will increase on each click −
Updated on: 18-Jul-2020
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