The handler.getOwnPropertyDescriptor function serves as a trap for the Object.getOwnPropertyDescriptor method. This function is defined as a property of the target object, which itself cannot be extended.
Syntax
Example
getOwnPropertyDescriptor: function(target, prop)
Parameters
Target : The target object.
Prop: The identifier of the property for which the details are to be obtained.
Return value
This method returns an object or undefined.
Browser Support
| Chrome | 49 |
|---|---|
Edge |
12 |
| Firefox | 18 |
| Opera | 36 |
Example 1
Example
const proxy = new Proxy({}, {
getOwnPropertyDescriptor: function(target, name) {
document.writeln('Java Script is a scripting language');
//expected output: Java Script is a scripting language
return Object.getOwnPropertyDescriptor(target, name);
}
});
console.dir(Object.getOwnPropertyDescriptor(proxy, 'foo'));
Output:
Output
Java Script is a scripting language
Example 2
Example
const r={}
const p = new Proxy(r, {
getOwnPropertyDescriptor: function(target, prop) {
document.write('Value : ' + prop);
return { configurable: true, enumerable: true, value: 10 };
}
});
document.writeln(Object.getOwnPropertyDescriptor(p, 'abc ').value);
Output:
Output
Value : abc 10
Example 3
Example
var a = {
eyeCount: 3
}
var b = {
getOwnPropertyDescriptor(target, prop) {
document.writeln(`Java Script proxt : ${prop}`);
return { configurable: true, value: 50};
}
};
const c= new Proxy(a, b);
document.writeln(Object.getOwnPropertyDescriptor(c, 'Own property').value);
Output:
Output
Java Script proxt : Own property 50
