WebAssembly.Table.prototype.get()
The get()
prototype method of
the WebAssembly.Table()
object retrieves a function reference stored at a
given index.
Syntax
js
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
Using get
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.
js
WebAssembly.instantiateStreaming(fetch("table.wasm")).then((obj) => {
const 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 |
---|
WebAssembly JavaScript Interface # dom-table-get |
Browser compatibility
BCD tables only load in the browser