Map.prototype.has()
The has() method returns a boolean indicating whether an element with the
specified key exists or not.
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Syntax
has(key)
Parameters
key-
The key of the element to test for presence in the
Mapobject.
Return value
true if an element with the specified key exists in the Map object;
otherwise false.
Examples
Using has()
const myMap = new Map();
myMap.set('bar', "foo");
myMap.has('bar'); // returns true
myMap.has('baz'); // returns false
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-map.prototype.has |
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