The add()
method appends a new object to the end of a WeakSet
object.
The add()
method appends a new object to the end of a WeakSet
object.
add(value)
Required. The object to add to the WeakSet
collection.
The WeakSet
object.
const ws = new WeakSet(); ws.add(window); // add the window object to the WeakSet ws.has(window); // true // WeakSet only takes objects as arguments ws.add(1); // results in "TypeError: Invalid value used in weak set" in Chrome // and "TypeError: 1 is not a non-null object" in Firefox
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
add |
36 |
12 |
34 |
No |
23 |
9 |
37 |
36 |
34 |
24 |
9 |
3.0 |
1.0 |
0.12.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet/add