Baseline Widely available
The set() method of WeakMap instances adds a new element with a specified key and value to this WeakMap.
const weakmap1 = new WeakMap();
const object1 = {};
const object2 = {};
weakmap1.set(object1, "foo");
weakmap1.set(object2, "bar");
console.log(weakmap1.get(object1));
// Expected output: "foo"
console.log(weakmap1.get(object2));
// Expected output: "bar"
key
Must be either an object or a non-registered symbol. The key of the entry to add to the WeakMap object.
value
Any value representing the value of the entry to add to the WeakMap object.
The WeakMap object.
TypeError
Thrown if key is not an object or a non-registered symbol.
const wm = new WeakMap();
const obj = {};
// Add new elements to the WeakMap
wm.set(obj, "foo").set(window, "bar"); // chainable
// Update an element in the WeakMap
wm.set(obj, "baz");
// Using a non-registered symbol as key
const sym = Symbol("foo");
wm.set(sym, "baz");
wm.set(Symbol.iterator, "qux");
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