The has()
method returns a boolean indicating whether an
element with the specified key exists or not.
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.has(key)
Parameters
key
- The key of the element to test for presence in the
Map
object.
Return value
true
if an element with the specified key exists in the Map
object; otherwise false
.
Examples
Using has()
let myMap = new Map()
myMap.set('bar', "foo")
myMap.has('bar') // returns true
myMap.has('baz') // returns false
Specifications
Browser compatibility
BCD tables only load in the browser