WebAssembly.Table.prototype.grow()

The grow() prototype method of the WebAssembly.Table object increases the size of the Table instance by a specified number of elements, filled with the provided value.

Syntax

grow(delta)
grow(delta, value)

Parameters

delta: The number of elements you want to grow the table by.
value Optional: The element to fill the newly-allocated space with.

Return value

The previous length of the table.

Exceptions

RangeError

Thrown in one of the following cases:

If the current size added with delta exceeds the Table instance's maximum size capacity.
If the client doesn't have enough memory for the allocation.

TypeError

Thrown if value is not a value of the element type of the table.

Examples

undefined

Using grow

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

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

Grow the table by 1 element using Table.grow():

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

Using grow with a value

The following example creates a new WebAssembly Table instance with an initial size of 0 and a maximum size of 4, filling it with an object:

const myObject = { hello: "world" };

const table = new WebAssembly.Table({
  element: "externref",
  initial: 0,
  maximum: 4,
});

Grow the table by 4 units and fill it with a value using WebAssembly.grow():

table.grow(4, myObject);
console.log(myObject === table.get(2)); // true

Specifications

WebAssembly JavaScript Interface