Last Updated : 12 Jul, 2025
JavaScript handler.deleteProperty() method in JavaScript is a trap for the delete operator. This method returns the boolean value if the delete was successful.
Syntax:
const p = new Proxy(target, {
deleteProperty: function(target, property) {
}
});
Parameters: This method accepts two parameters as mentioned above and described below:
Return value: This method returns a Boolean value that indicates whether the property was successfully deleted.
Below examples illustrate the handler.deleteProperty() method in JavaScript:
Example 1: In this example, we will trap a delete operator using the handler.deleteProperty() method in JavaScript.
const monster1 = {
Color: 'Green'
};
const handler1 = {
deleteProperty(target, prop) {
if (prop in target) {
delete target[prop];
console.log(`${prop} is property which is removed`);
}
}
};
console.log(monster1.Color);
const proxy1 = new Proxy(monster1, handler1);
delete proxy1.Color;
console.log(monster1.Color);
let f = { bar: 'baz' }
console.log('bar' in f)
delete f.bar
console.log('bar' in f)
Output:
"Green" "Color is property which is removed" undefined true false
Example 2: In this example, we will trap a delete operator using the handler.deleteProperty() method in JavaScript.
javascript
const obj = new Proxy({}, {
deleteProperty: function (target, prop) {
if (prop in target) {
delete target[prop]
console.log(prop + ' property is removed.')
return true
}
else {
console.log(prop + ' property is not removed.')
return false
}
}
})
let result
obj.prop1 = 10
console.log('prop1' in obj)
result = delete obj.prop1
console.log(result)
console.log('prop1' in obj)
result = delete obj.prop1
console.log(result)
Output:
true "prop1 property is removed." true false "prop1 property is not removed." false
Supported Browsers: The browsers supported by the handler.deleteProperty() method are listed below:
We have a complete list of Javascript Proxy/handler methods, to check those go through the Javascript Proxy/handler Reference article.
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