surma/.gitignore

## .gitignore
node_modules
package-lock.json

## _README.md

      
    Raw
  

              _README.md
            
          
    A simple demo showing go routines and JS/Go integration.
Build

$ npm install
$ npm run build
$ npm run serve


License Apache-2

  
## 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>

## 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 <surma@google.com>",
  "license": "Apache-2.0",
  "devDependencies": {
    "http-server": "^0.11.1"
  }
}

## 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)
	}
}

## sieve.wasm

      
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              sieve.wasm
            
          
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## wasm_exec.js

      
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              wasm_exec.js
            
          
            View raw
              (Sorry about that, but we can’t show files that are this big right now.)
	<!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 <surma@google.com>",
	"license": "Apache-2.0",
	"devDependencies": {
	"http-server": "^0.11.1"
	}
	}