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Map.prototype.has()

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The has() method returns a boolean indicating whether an element with the specified key exists or not.

Syntax

myMap.has(key);

Parameters

key
Required. The key of the element to test for presence in the Map object.

Return value

Boolean
Returns true if an element with the specified key exists in the Map object; otherwise false.

Examples

Using the has method

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

myMap.has("bar");  // returns true
myMap.has("baz");  // returns false

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Map.prototype.has' in that specification.
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Map.prototype.has' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 38 13.0 (13.0) 11 25 7.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support 38 13.0 (13.0) No support No support 8

See also

Etiquetas y colaboradores del documento

 Colaboradores en esta página: fscholz, realityking
 Última actualización por: fscholz,