WebAssembly.Table.prototype.get()

The get() prototype method of the WebAssembly.Table() object retrieves a function reference stored at a given index.

Syntax

var funcRef = table.get(index);

Parameters

index
The index of the function reference you want to retrieve.

Return value

A function reference — this is an exported WebAssembly function, a JavaScript wrapper for an underlying wasm function.

Exceptions

If index is greater than or equal to Table.prototype.length, a RangeError is thrown.

Examples

The following example (see table.html on GitHub, and view it live also) compiles and instantiates the loaded table.wasm byte code using the WebAssembly.instantiateStreaming() method. It then retrieves the references stored in the exported table.

WebAssembly.instantiateStreaming(fetch('table.wasm'))
.then(function(obj) {
  var tbl = obj.instance.exports.tbl;
  console.log(tbl.get(0)());  // 13
  console.log(tbl.get(1)());  // 42
});

Note how you've got to include a second function invocation operator at the end of the accessor to actually retrieve the value stored inside the reference (e.g. get(0)() rather than get(0)) — it is a function rather than a simple value.

Specifications

Specification Status Comment
WebAssembly JavaScript Interface
The definition of 'get()' in that specification.
Working Draft Initial draft definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 57Edge Full support 16Firefox Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
IE No support NoOpera Full support 44Safari Full support 11WebView Android Full support 57Chrome Android Full support 57Edge Mobile Full support Yes
Disabled
Full support Yes
Disabled
Disabled This feature is behind the Experimental JavaScript Features preference.
Firefox Android Full support 52
Notes
Full support 52
Notes
Notes Disabled in the Firefox 52 Extended Support Release (ESR).
Opera Android ? Safari iOS Full support 11Samsung Internet Android Full support 7.0nodejs Full support 8.0.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

See also

Document Tags and Contributors

Contributors to this page: chrisdavidmills, fscholz
Last updated by: chrisdavidmills,