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WorkerGlobalScope.self

The self read-only property of the WorkerGlobalScope interface returns a reference to the WorkerGlobalScope itself. Most of the time it is a specific scope like DedicatedWorkerGlobalScope, SharedWorkerGlobalScope, or ServiceWorkerGlobalScope.

Syntax

var selfRef = self;

Value

A global scope object (differs depending on the type of worker you are dealing with, as indicated above).

Example

If you called

console.log(self);

inside a worker, you will get a worker global scope of the same type as that worker object written to the console — something like the following:

DedicatedWorkerGlobalScope {
undefined: undefined, Infinity: Infinity, Math: MathConstructor, NaN: NaN, Intl: Object…}
    Infinity: Infinity
    Array: function Array() { [native code] }
      arguments: null
      caller: null
      isArray: function isArray() { [native code] }
      length: 1
      name: "Array"
      observe: function observe() { [native code] }
      prototype: Array[0]
      unobserve: function unobserve() { [native code] }
      __proto__: function Empty() {}
      <function scope>
    ArrayBuffer: function ArrayBuffer() { [native code] }
    Blob: function Blob() { [native code] }
    Boolean: function Boolean() { [native code] }
    DataView: function DataView() { [native code] }
    Date: function Date() { [native code] }
    DedicatedWorkerGlobalScope: function DedicatedWorkerGlobalScope() { [native code] }
    Error: function Error() { [native code] }
// etc. etc.

This provides a full list of the objects available to that worker scope, so it is quite a useful test if you want to see whether something is available to your worker or not. We also maintain a list of Functions and classes available to Web Workers.

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
self
4
12
3.5
10
11.5
4
37
40
34
Yes
5
4.0

See also

WorkerGlobalScope

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https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/self