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JavaScript WeakSet
tryjs_weakset_2
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<!DOCTYPE html> <html> <body> <h1>JavaScript WeakSet</h1> <p id="demo"></p> <script> // Create a WeakSet let mySet = new WeakSet(); // Create an Object let myObj = {fname:"John", lname:"Doe"}; // Add the Object mySet.add(myObj); // Delete the Object mySet.delete(myObj); // Do I have myObj in the mySet? let answer = mySet.has(myObj); document.getElementById("demo").innerHTML = "Do I have myObj? is " + answer </script> </body> </html>