Map.prototype.get() - JavaScript 编辑

The get() method returns a specified element from a Map object. If the value that is associated to the provided key is an object, then you will get a reference to that object and any change made to that object will effectively modify it inside the Map object.

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.

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.get(key)

Parameters

key

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

Return value

The element associated with the specified key, or undefined if the key can't be found in the Map object.

Examples

Using get()

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

myMap.get('bar');   // Returns "foo"
myMap.get('baz');   // Returns undefined

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Map.prototype.get' in that specification.

Browser compatibility

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See also

• Map
• Map.prototype.set()
• Map.prototype.has()