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JavaScript WeakSet
The JavaScript WeakSet is used for storing collection of objects. Like set it doesn’t store duplicates.
Methods of WeakSet −
| Method | Description |
|---|---|
| add(obj) | Append new value to the weakSet. |
| delete(obj) | Deletes the value from weakSet. |
| has(obj) | Returns true or false depending upon if the weakSet object contains the value or not. |
| length() | Returns the weakSet object length |
Following is the code for the WeakSet 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: 18px;
font-weight: 500;
color: red;
}
</style>
</head>
<body>
<h1>JavaScript WeakSet</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>
CLICK the above button to add obj1 and obj2 to the WeakSet object
</h3>
<script>
let resultEle = document.querySelector(".result");
let weakObj = new WeakSet();
let obj1 = { a: 22 };
let obj2 = { b: 44 };
document.querySelector(".Btn").addEventListener("click", () => {
weakObj.add(obj1);
resultEle.innerHTML += "Obj1 added to weakset <br>";
weakObj.add(obj2);
resultEle.innerHTML += " Obj2 added to weakset <br>";
});
</script>
</body>
</html>Output
On clicking the ‘CLICK HERE’ button −
Updated on: 12-May-2020
54 Views
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