The Proxy.revocable() method is a built-in method in JavaScript that creates a revocable Proxy object. This method returns an object that contains two properties: proxy and revoke.
The proxy property is a Proxy object, which is used to intercept and handle operations on another object. The revoke property is a function that can be called to revoke the Proxy, which means that any further operation on the proxy object will throw a TypeError.
Here’s an example of how to use the Proxy.revocable() method:
Syntax:
Proxy.revocable(tar, hand)
Parameters: This method accepts two parameters.
- tar: It is the object on which we want the proxy to be applied.
- hand: This object contains the logic function which defines how the proxy will operate on the target object.
Return Value: It returns a plain JavaScript object with two values where the first value is the proxy object and the second object is the revoke function to detach the proxy.
Example 1: This example will create a Proxy object which we can revoke.
Javascript
let details = { name: "Raj", Course: "DSA",}const {proxy, revoke} = Proxy.revocable(details, {});console.log(proxy.name);console.log(proxy.Course);revoke();console.log(proxy.name); |
Output: We get an error if we try to access the Proxy object after it has been revoked
Example 2: This example revokes a proxy based on a condition.
Javascript
let details = { name: "Raj", Course: "DSA",}const {proxy, revoke} = Proxy.revocable(details, { get: function(tar, prop){ if(prop == "Course"){ revoke(); return undefined; } return tar[prop]; }});console.log(proxy.name);console.log(proxy.Course);console.log(proxy.name); |
Output: If we try to access the Course in the details the Proxy object gets revoked
Supported Browsers:
- Chrome
- Edge
- Firefox
- Opera
- Safari
We have a complete list of JavaScript Proxy methods, to check Please go through the JavaScript Proxy Reference article.
