JavaScript Map has()
Example
// Create a Map
const fruits = new Map([
["apples", 500],
["bananas", 300],
["oranges", 200]
]);
// Does the map has apples?
fruits.has("apples");
Try it Yourself »
Try This:
fruits.delete("apples");
fruits.has("apples");
Try it Yourself »
Description
The has() method returns true if a key exists in a map.
Syntax
map.has(value)
Parameters
| Parameter | Description |
| value | Required. The key to test for. |
Return Value
| Type | Description |
| Boolean | true if the key exists, otherwise false. |
Browser Support
map.has() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
map.has() is not supported in Internet Explorer.
