Baseline Widely available
The set() method of Map instances adds or updates an entry in this map with a specified key and a value.
const map1 = new Map();
map1.set("bar", "foo");
console.log(map1.get("bar"));
// Expected output: "foo"
console.log(map1.get("baz"));
// Expected output: undefined
key
The key of the element to add to the Map object. The key may be any JavaScript type (any primitive value or any type of JavaScript object).
value
The value of the element to add to the Map object. The value may be any JavaScript type (any primitive value or any type of JavaScript object).
The Map object.
const myMap = new Map();
// Add new elements to the map
myMap.set("bar", "foo");
myMap.set(1, "foobar");
// Update an element in the map
myMap.set("bar", "baz");
Since the set() method returns back the same Map object, you can chain the method call like below:
// Add new elements to the map with chaining.
myMap.set("bar", "foo").set(1, "foobar").set(2, "baz");
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