Hello World in raw WebAssembly

hello.html

<meta charset="utf-8">
<script type="text/javascript" src="hello.js"></script>

hello.js

var memory = new WebAssembly.Memory({initial:256, maximum:256});

var print = function(ptr, len) {
	console.log(new TextDecoder().decode(new DataView(memory.buffer, ptr, len)));
};

var imports = {
	'env': {
		'memory': memory,
		'print': print,
	}
};

fetch('hello.wasm')
	.then(response => response.arrayBuffer())
	.then(bytes => WebAssembly.instantiate(bytes, imports))
	.then(results => results.instance.exports._main());

hello.wast

; convert to wasm with wast2wasm from https://github.com/WebAssembly/wabt
(module
  (type (;0;) (func (param i32 i32)))
  (type (;1;) (func))
  (import "env" "memory" (memory (;0;) 256 256))
  (import "env" "print" (func (;0;) (type 0)))
  (func (;1;) (type 1)
    i32.const 1400
    i32.const 13  ;; length
    call 0)
  (export "_main" (func 1))
  (data (i32.const 1400) "Hello, world!"))