Baseline Widely available
ÐеÑод add()
добавлÑÐµÑ Ð½Ð¾Ð²Ñй обÑÐµÐºÑ Ð² ÐºÐ¾Ð½ÐµÑ Ð¾Ð±ÑекÑа WeakSet.
ÐбÑзаÑелен. ÐбÑекÑ, добавлÑемÑй в WeakSet.
var ws = new WeakSet();
ws.add(window); // добавлÑÐµÑ Ð¾Ð±ÑÐµÐºÑ window в WeakSet
ws.has(window); // true
// Weakset пÑÐ¸Ð½Ð¸Ð¼Ð°ÐµÑ Ð² каÑеÑÑве паÑамеÑÑов ÑолÑко обÑекÑÑ
ws.add(1);
// ÑезÑлÑÑÐ°Ñ Ð² Chrome: "TypeError: Invalid value used in weak set"
// ÑезÑлÑÑÐ°Ñ Ð² Firefox: "TypeError: 1 is not a non-null object"
СпеÑиÑикаÑии СовмеÑÑимоÑÑÑ Ñ Ð±ÑаÑзеÑами СмоÑÑиÑе Ñакже
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