Baseline Widely available
The has() method of Map instances returns a boolean indicating whether an element with the specified key exists in this map or not.
const map1 = new Map();
map1.set("bar", "foo");
console.log(map1.has("bar"));
// Expected output: true
console.log(map1.has("baz"));
// Expected output: false
key
The key of the element to test for presence in the Map object.
true if an element with the specified key exists in the Map object; otherwise false.
const myMap = new Map();
myMap.set("bar", "foo");
console.log(myMap.has("bar")); // true
console.log(myMap.has("baz")); // false
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