Jscex: Write Sexy JavaScript (中文)

JscexWrite Sexy JavaScript - - 2011.5

• / / Jeffrey Zhao /•• http://blog.zhaojie.me/• @• F#, JavaScript, Scala, C#, Python, .NET, Mono...• Java

Jscex• JavaScript Computation EXpression• JavaScript• F# JavaScript • “ ” • JavaScript JavaScript

Jscex• • Jscex JavaScript• • Jscex /• JavaScript / • ECMAScript 3

JavaScript•••

• JavaScript • while / for / for...in / do • if / switch • try...catch...ﬁnally • return / break / continue / throw• • with • break continue • switch break•

• JavaScript• “bind” $await • • “ ” • “ ”

• JavaScript•• • JIT

••• • •

//var somethingAsync = eval(Jscex.compile("async", function (...) { // }));

function () { var res = $await(<async work>);}

function () { var res = $await(<async work>);} HTTP UI Web Service

function () { var img = $await(readAsync("http://...")); console.log("loaded!"); $await(writeAsync("./files/...")); console.log("saved!"); } =(function () { var _b_ = Jscex.builders["async"]; return _b_.Start(this, _b_.Delay(function () { _b_.Bind(readAsync(...), function (img) { console.log("loaded!"); return _b_.Bind(writeAsync(...), function () { console.log("saved!"); return _b_.Normal(); }); }); }) );})

Expressvar app = express.createServer();app.get(/, function (req, res) { /** * * * 1. * 2. * * 3. res * * “ ” **/});app.listen(3000);

app.getAsync(/, eval(Jscex.compile("async", function (req, res) { var keys = $await(db.getKeysAsync(...)); var results = []; for (var i = 0; i < keys.length; i++) { var r = $await(cache.getAsync(keys[i])); if (!r) { r = $await(db.getAsync(keys[i])); } results.push(r); } res.send(generateList(results));})));

I/O• I/O • Web ••• I/O •

• • • $await(Jscex.Async.parallel(taskA, taskB)) • $await(taskA.continueWith(taskB))• $await • •• • taskA.start(); $await(taskB); $await(taskA);

//var i = 1;conn.onAsync("data", eval(Jscex.compile("async", function () { var id = i++; $await(step1); console.log("step 1 - request " + id); $await(step2); console.log("step 2 - request " + id); /** * * step 1 - request 1 * step 1 - request 2 * step 2 - request 2 * step 2 - request 1 **/})));

Erlangvar i = 0;var agent = Agent.start(eval(Jscex.compile("async", function (mailbox) { var id = i++; var msg = $await(mailbox.receive()); $await(step1); console.log("step 1 - request " + id); $await(step2); console.log("step 2 - request " + id);})));conn.on("data", function (data) { // mailbox agent.send(data);});

• • JIT • AOT• • • Python C# JavaScript 1.7 • …

AOT// AOTAgent.start(eval(Jscex.compile("async", function (mailbox) { ...})));// AOT//// gzip 3kbAgent.start((function (mailbox) { var _b_ = Jscex.builders["async"]; return _b_.Start(this, ... );}));

Jscex• • “ ”•

//var fib = eval(Jscex.compile("seq", function () { var i = 0, j = 1; while (true) { $yield(i); // the bind operation var t = i; i = j; j += t; }}));var iter = fib().skip(10).take(10);while (iter.moveNext()) { console.log(iter.current);}

… Maybe Monadvar maybeFunc = function () { var maybeA = getA(); if (maybeA == Maybe.None) return Maybe.None; var maybeB = getB(); if (maybeB == Maybe.None) return Maybe.None; return maybeA.value + maybeB.value;}//var maybeFunc = eval(Jscex.compile("maybe", function () { var a = $try(getA()); var b = $try(getB()); return a + b;}));

• “ ” “ ” • •• • Jscex /

• • • “debugger”• • Start, Delay, Combine • Loop, Try • Normal, Return, Break, Continue, Throw • Bind

Node.js

• BSD• https://github.com/JeffreyZhao/jecex

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Jscex: Write Sexy JavaScript (中文)

by jeffz on May 15, 2011

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