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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/WeakMap/set below:

WeakMap.prototype.set() - JavaScript | MDN

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El método set() añade un nuevo elemento con su key y value específicos al objeto 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"

indentificador (key)

Requerido. El identificador (objeto) del elemento a añadir al objeto WeakMap.

valor (value)

Requerido. El valor del elemento a añadir al objeto WeakMap.

El objeto WeakMap.

var wm = new WeakMap();
var obj = {};

// Agregando nuevos elementos a WeakMap
wm.set(obj, "foo").set(window, "bar"); // encadenamiento
// Actualiza el un elemento en el objeto WeakMap
wm.set(obj, "baz");

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