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JavaScript handler deleteProperty() Method

JavaScript handler deleteProperty() Method with examples on javascript handler, javascript methods, javascript tutorial, apply(), construct(), defineProperty(), deleteProperty(), get(), setPrototypeOf(), set(), ownKeys(), isExtensible() etc.

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JavaScript handler.deleteProperty() Method

The handler.deleteProperty() method used to remove the property entirely using the delete operator. This method returns true if the delete was successful.

Syntax

deleteProperty: function(target, property)

Parameters

Target: The target object.

Property: The name of the property to delete.

Return value

This method returns a Boolean value. It indicates that property successfully deletes or not.

Browser Support

Chrome 49
Edge 12
Firefox 18
Opera 36

Example 1

var proxy = new Proxy({}, {
  deleteProperty: function(target, prop) {
    document.writeln("Called: " + prop);
    return true;
    //if sucessfullt delete,return true.
  }
});delete proxy.abc;
Test it Now

Output:

Called: abc

Example 2

var proxy = new Proxy({}, {
  deleteProperty: function(target, name) {
    document.write('In delete Property  ');
 
    return delete target[name];
  }
});
delete proxy.foo;
document.writeln(proxy.name);
Test it Now

Output:

In delete Property undefined

Example 3

var f = { bar: 'baz' }
f.bar = 'baz'
document.writeln('bar' in f)

delete f.bar
document.writeln('bar' in f)

var foo = { bar: 'baz' }
foo.bar = 'baz'
document.writeln('bar' in foo)
Test it Now

Output:

true false true

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