Map.prototype.delete() - JavaScript 编辑

The delete() method removes the specified element from a Map object by key.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

myMap.delete(key);

Parameters

key

The key of the element to remove from the Map object.

Return value

true if an element in the Map object existed and has been removed, or false if the element does not exist.

Examples

Using delete()

var myMap = new Map();
myMap.set('bar', 'foo');

myMap.delete('bar'); // Returns true. Successfully removed.
myMap.has('bar');    // Returns false. The "bar" element is no longer present.

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Map.prototype.delete' in that specification.
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Map.prototype.delete' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Map