The handler.deleteProperty()
method is a trap for the delete
operator.
Syntax
var p = new Proxy(target, { deleteProperty: function(target, property) { } });
Parameters
The following parameters are passed to the deleteProperty
method. this
is bound to the handler.
target
- The target object.
property
- The name of the property to delete.
Return value
The deleteProperty
method must return a Boolean
indicating whether or not the property has been successfully deleted.
Description
The handler.deleteProperty()
method is a trap for the delete
operator.
Interceptions
This trap can intercept these operations:
- Property deletion:
delete proxy[foo]
anddelete proxy.foo
Reflect.deleteProperty()
Invariants
If the following invariants are violated, the proxy will throw a TypeError
:
- A property cannot be deleted, if it exists as a non-configurable own property of the target object.
Examples
The following code traps the delete
operator.
var p = new Proxy({}, { deleteProperty: function(target, prop) { if (prop in target){ delete target[prop] console.log('property removed: ' + prop) return true } else { console.log('property not found: ' + prop) return false } } }) var result p.a = 10 console.log('a' in p) // true result = delete p.a // "property removed: a" console.log(result) // true console.log('a' in p) // false result = delete p.a // "property not found: a" console.log(result) // false
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of '[[Delete]]' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of '[[Delete]]' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 49 | 12 | 18 | No | 36 | 10 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 49 | 49 | Yes | 18 | No | 36 | 10 |
See also
Proxy
handler
delete
operatorReflect.deleteProperty()