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");
console.log(myMap.has("bar")); // true
console.log(myMap.has("baz")); // false
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-map.prototype.has |
Browser compatibility
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