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:
- Target: This parameter holds the target object.
- Property: This parameter holds the name of the property which is to be deleted.
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.
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.barconsole.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 resultobj.prop1 = 10console.log('prop1' in obj)result = delete obj.prop1console.log(result)console.log('prop1' in obj)result = delete obj.prop1console.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:
- Google Chrome 49 and above
- Edge 12 and above
- Firefox 18 and above
- Opera 36 and above
- Safari 10 and above
We have a complete list of Javascript Proxy/handler methods, to check those go through the Javascript Proxy/handler Reference article.
