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How to create constants in JavaScript? Explain with examples.
Following is the code to create constants in JavaScript −
Example
<!DOCTYPE html>
<html>
<head>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
</style>
</head>
<body>
<h1>Const example</h1>
<button class="Btn">CLICK HERE</button>
<p class="sample"></p>
<h3>Click the above button to try changing const value</h3>
<script>
let sampleEle = document.querySelector(".sample");
const a = 33;
sampleEle.innerHTML = "a = " + a + "<br>";
document.querySelector(".Btn").addEventListener("click", () => {
try {
a = 44;
}
catch (err) {
sampleEle.innerHTML += "Error : " + err;
}
});
</script>
</body>
</html>Output
The above code will produce the following output −
On clicking the ‘CLICK HERE’ button to change constant value −
Updated on: 16-Jul-2020
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