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 our fetchAndInstantiate()
utility function. It then retrieves the references stored in the exported table.
fetchAndInstantiate('table.wasm').then(function(instance) { var tbl = 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 API The definition of 'get()' in that specification. |
Draft | Initial draft definition. |
Browser compatibility
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 57 | 16 | 522 | No | 44 | 11 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 57 | 57 | Yes1 | 522 | No | ? | 11 |
1. This feature is behind the Experimental JavaScript Features
preference.
2. Disabled in the Firefox 52 Extended Support Release (ESR).