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The new.target in JavaScript
The new.target is a metaproperty that allows us to determine at runtime whether a function or constructor was called using the new keyword or not.
Following is the code for new.target 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>new.target in JavaScript.</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to call the Student constructor without the new keyword</h3>
<script>
let resEle = document.querySelector(".result");
let BtnEle = document.querySelector(".Btn");
function Student(name, age, place) {
if (!new.target) {
resEle.innerHTML ="Error : Student should be used with the new operator";
}
this.name = name;
this.age = age;
this.place = place;
}
BtnEle.addEventListener("click", () => {
Student("Shawn", 22, "Delhi");
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button −
Updated on: 20-Jul-2020
116 Views
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