This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The length prototype property of the WebAssembly.Table object returns the length of the table, i.e. the number of elements in the table.




The following example creates a new WebAssembly Table instance with an initial size of 2 and a maximum size of 10.

var table = new WebAssembly.Table({ element: "anyfunc", initial: 2, maximum: 10 });

You can then grow the table by 1 with the following:

console.log(table.length);   // "2"
console.log(table.grow(1));  // "2"
console.log(table.length);   // "3"


Specification Status Comment
Web Assembly JavaScript API
The definition of 'length' in that specification.
Draft Initial draft definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic Support5716522 No4411
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support5757 (Yes)1522 No ?11

1. , this feature is behind the Experimental JavaScript Features preference.

2. Disabled in the Firefox 52 Extended Support Release (ESR).

See also

Document Tags and Contributors

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