surma · April 5, 2019 09:15
diff --git a/.gitignore b/.gitignore
 node_modules
 package-lock.json
diff --git a/_README.md b/_README.md
diff --git a/index.html b/index.html
 <!doctype html>
 <!--
 /**
 * Copyright 2018 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 -->

 <pre></pre>
 <script src="wasm_exec.js"></script>
 <script>
  const pre = document.querySelector('pre');
  function goCallback(v) {
    pre.textContent += `${v}\n`;
  }
  async function init() {
    const go = new Go();
    const {instance} = await WebAssembly.instantiateStreaming(fetch("/sieve.wasm"), go.importObject);
    await go.run(instance);
  }
  init();
 </script>
diff --git a/package.json b/package.json
 {
  "name": "wasmgo",
  "version": "0.0.1",
  "description": "Simple Go wasm demo",
  "scripts": {
    "build": "GOOS=js GOARCH=wasm go build -o sieve.wasm sieve.go",
    "serve": "http-server -c0"
  },
  "author": "Surma <[email protected]>",
  "license": "Apache-2.0",
  "devDependencies": {
    "http-server": "^0.11.1"
  }
 }
diff --git a/sieve.go b/sieve.go
 /**
 * Copyright 2018 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 package main

 import (
 	"log"
 	"syscall/js"
 )

 func filter(i int64, cIn <-chan int64) <-chan int64 {
 	cOut := make(chan int64)
 	go func() {
 		for v := range cIn {
 			if v%i != 0 {
 				cOut <- v
 			}
 		}
 		close(cOut)
 	}()
 	return cOut
 }

 func generator(start int64, end int64) <-chan int64 {
 	cOut := make(chan int64)
 	go func() {
 		for i := start; i < end; i++ {
 			cOut <- i
 		}
 		close(cOut)
 	}()
 	return cOut
 }

 func main() {
 	callback := js.Global().Get("goCallback")
 	if callback == js.Undefined() {
 		log.Fatalf("No `goCallback` found on global")
 	}
 	out := generator(2, 1000)
 	var v int64
 	var ok bool
 	for {
 		v, ok = <-out
 		if !ok {
 			return
 		}
 		callback.Invoke(v)
 		out = filter(v, out)
 	}
 }
diff --git a/sieve.wasm b/sieve.wasm
diff --git a/wasm_exec.js b/wasm_exec.js
	<!doctype html>
	<!--
	/**
	* Copyright 2018 Google Inc. All Rights Reserved.
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	* http://www.apache.org/licenses/LICENSE-2.0
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	-->

	<pre></pre>
	<script src="wasm_exec.js"></script>
	<script>
	const pre = document.querySelector('pre');
	function goCallback(v) {
	pre.textContent += `${v}\n`;
	}
	async function init() {
	const go = new Go();
	const {instance} = await WebAssembly.instantiateStreaming(fetch("/sieve.wasm"), go.importObject);
	await go.run(instance);
	}
	init();
	</script>
	{
	"name": "wasmgo",
	"version": "0.0.1",
	"description": "Simple Go wasm demo",
	"scripts": {
	"build": "GOOS=js GOARCH=wasm go build -o sieve.wasm sieve.go",
	"serve": "http-server -c0"
	},
	"author": "Surma <[email protected]>",
	"license": "Apache-2.0",
	"devDependencies": {
	"http-server": "^0.11.1"
	}
	}