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

Set.prototype.delete() - JavaScript | MDN

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El método delete() remueve el elemento especificado del objeto Set.

valor

Requerido. El valor del elemento a remover del objeto Set.

true si el elemento ha sido removido exitosamente en el Set; de otra manera retorna false.

var mySet = new Set();
mySet.add("foo");

mySet.delete("bar"); // Retorna false. No hay elemento "bar" para ser removido.
mySet.delete("foo"); // Retorna true.  Removido exitosamente.

mySet.has("foo"); // Retorna false. El elemento "foo" ya no está presente.

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