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 »
const fruits = new Map([
["apples", 500],
["bananas", 300],
["oranges", 200]
]);
// Does the map has apples?
fruits.has("apples");
Try This:
fruits.delete("apples");
fruits.has("apples");
Try it Yourself »
fruits.has("apples");
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.
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 2015) feature.
JavaScript 2015 is supported in all browsers since June 2017:
| Chrome 51 |
Edge 15 |
Firefox 54 |
Safari 10 |
Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |