WebAssembly.memory.buffer

The buffer() protoype property of the Memory object returns the buffer contained in the memory.

Syntax

var myBuffer = memory.buffer;

Value

A buffer object.

Examples

The following example (see memory.html on GitHub, and view it live also) fetches and instantiates the loaded memory.wasm byte code using our fetchAndInstantiate() utility function. It then exports a memory from the module, stores some values in it, then exports a function and uses it to sum some values.

fetch('memory.wasm').then(function(response) {
  response.arrayBuffer().then(function(bytes) {
    WebAssembly.instantiate(bytes).then(function(obj) {
      var i32 = new Uint32Array(obj.instance.exports.mem.buffer);
      for (var i = 0; i < 10; i++) {
        i32[i] = i;
      }
      var sum = obj.instance.exports.accumulate(0, 10);
      console.log(sum);
    })
  })
});

Specifications

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

Browser compatibility

[1] Experimental support can be enabled in Chrome 51+ and Opera 38+ by going to chrome://flags and enabling the Experimental WebAssembly flag.

[2] Experimental support can be enabled in Firefox 47+ by enabling the javascript.options.wasm flag in about:config.

See also

• WebAssembly landing page.
• WebAssembly concepts
• Using the WebAssembly JavaScript API