WebAssembly.Memory.prototype.buffer

The buffer prototype property of the WebAssembly.Memory object returns the buffer contained in the memory.

Examples

Using buffer

The following example (see memory.html on GitHub, and view it live also) fetches and instantiates the loaded memory.wasm byte code using the WebAssembly.instantiateStreaming() method, while importing the memory created in the line above. It then stores some values in that memory, then exports a function and uses it to sum some values.

WebAssembly.instantiateStreaming(fetch('memory.wasm'), { js: { mem: memory } })
.then(obj => {
  var i32 = new Uint32Array(memory.buffer);
  for (var i = 0; i < 10; i++) {
    i32[i] = i;
  }
  var sum = obj.instance.exports.accumulate(0, 10);
  console.log(sum);
});

Specifications

Browser compatibility

See also

• WebAssembly overview page
• WebAssembly concepts
• Using the WebAssembly JavaScript API