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An-Exhibition-of-PLs.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<title>An Exhibition of PLs</title>
<style type="text/css">
/* Color Palette Based on Monokai
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dark grey : #272822
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blue : #1db4d0
lavender : #bf79db
magenta : #f92672
light green : #a6e22e
*/
@import url(https://fonts.googleapis.com/css?family=Hind:400,500,600,700,300);
@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,300,600,700);
@import url(https://fonts.googleapis.com/css?family=Inconsolata:400,700);
/* Theme Styles */
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height: 128px;
width: 128px !important;
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/* The following is needed for the ESC overview slide selection */
.slides {
display: flex;
flex-wrap: wrap;
justify-content: center;
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.slides.active .slide:not(.hidden) {
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/*
github.com style (c) Vasily Polovnyov <[email protected]>
*/
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.prev,
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</style>
</head>
<body>
<div class="progress">
<div class="progress-bar"></div>
</div>
<div class="slides">
<div class="slide-wrapper">
<div class="slide ----" id="slide-1">
<div data-id="1" class="slide-overlay"></div>
<section class="slide-content"><h1 id="an-exhibition-of-pls">An Exhibition of PLs</h1>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-2">
<div data-id="2" class="slide-overlay"></div>
<section class="slide-content"><h1 id="object-oriented-programming">Object Oriented Programming</h1>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-3">
<div data-id="3" class="slide-overlay"></div>
<section class="slide-content"><h3 id="object-oriented-programming">Object Oriented Programming</h3>
<ul>
<li>Prototypical Inheritance (Javascript)</li>
<li>Mixin & Trait (Scala)</li>
<li>Extend (Swift)</li>
<li>Attribute (Swift)</li>
<li>Polymorphism in Dynamical Language</li>
</ul>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-4">
<div data-id="4" class="slide-overlay"></div>
<section class="slide-content"><h1 id="prototypical-inheritance">Prototypical Inheritance</h1>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-5">
<div data-id="5" class="slide-overlay"></div>
<section class="slide-content"><h3 id="use-module-and-table-to-perform-oop">Use module and table to perform OOP</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> EventModule = { <span class="hljs-comment">// singleton/object in scala</span>
<span class="hljs-string">'New'</span>:<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">title</span>) </span>{
<span class="hljs-keyword">var</span> instance = {};
instance.title = title;
instance.audiences = [];
<span class="hljs-keyword">return</span> instance;
},
<span class="hljs-string">'join'</span>:<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">instance,name</span>)</span>{
instance.audiences.push(name);
}
}
<span class="hljs-keyword">var</span> e = EventModule.New(<span class="hljs-string">"zju-lambda speech"</span>);
EventModule.join(e,<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-6">
<div data-id="6" class="slide-overlay"></div>
<section class="slide-content"><h3 id="how-about-the-inheritance-">How about the inheritance?</h3>
<pre><code class="lang-javascript"><span class="hljs-comment">// just copy and modify the module</span>
<span class="hljs-keyword">var</span> SpecialEventModule = {};
<span class="hljs-keyword">for</span>(key <span class="hljs-keyword">in</span> EventModule)
SpecialEventModule[key] = EventModule[key];
SpecialEventModule.New = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-keyword">var</span> instance = EventModule.New(<span class="hljs-string">"special"</span>);
instance.theme = theme;
<span class="hljs-keyword">return</span> instance;
}
SpecialEventModule.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">instance</span>) </span>{
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);
}
<span class="hljs-keyword">var</span> e = SpecialEventModule.New(<span class="hljs-string">"monad"</span>);
SpecialEventModule.spec_fun(e);
</code></pre>
</section>
</div>
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<div data-id="7" class="slide-overlay"></div>
<section class="slide-content"><h3 id="use-closure-to-perform-oop">Use closure to perform OOP</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> EventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">title</span>) </span>{
<span class="hljs-keyword">var</span> instance = {};
instance.title = title;
instance.audiences = [];
instance.join = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">name</span>)</span>{
instance.audiences.push(name);
}
<span class="hljs-keyword">return</span> instance;
}
<span class="hljs-keyword">var</span> e = EventConstructor(<span class="hljs-string">"zju-lambda speech"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
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<div data-id="8" class="slide-overlay"></div>
<section class="slide-content"><h3 id="again-how-about-the-inheritance-">Again, how about the inheritance?</h3>
<pre><code class="lang-javascript"><span class="hljs-comment">// just call the base class's constructor first</span>
<span class="hljs-keyword">var</span> SpecialEventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-keyword">var</span> instance = EventConstructor(<span class="hljs-string">"special"</span>);
instance.theme = theme;
instance.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);}
<span class="hljs-keyword">return</span> instance;
}
<span class="hljs-keyword">var</span> e = SpecialEventConstructor(<span class="hljs-string">"monad"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
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<div data-id="9" class="slide-overlay"></div>
<section class="slide-content"><h3 id="all-above-are-too-tedious">All above are too tedious</h3>
<pre><code class="lang-javascript"><span class="hljs-comment">// and now, we have `this` as syntactic sugar</span>
<span class="hljs-keyword">var</span> EventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">title</span>) </span>{
<span class="hljs-keyword">this</span>.title = title;
<span class="hljs-keyword">this</span>.audiences = [];
<span class="hljs-keyword">this</span>.join = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">name</span>)</span>{
<span class="hljs-keyword">this</span>.audiences.push(name);
}
}
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> EventConstructor(<span class="hljs-string">"zju-lambda speech"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-10">
<div data-id="10" class="slide-overlay"></div>
<section class="slide-content"><h3 id="there-are-too-many-function-objects">There are too many function objects</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> EventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">title</span>) </span>{
<span class="hljs-keyword">this</span>.title = title;
<span class="hljs-keyword">this</span>.audiences = [];
}
EventConstructor.prototype.join = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">name</span>) </span>{
<span class="hljs-keyword">this</span>.audiences.push(name);
}
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> EventConstructor(<span class="hljs-string">"zju-lambda speech"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-11">
<div data-id="11" class="slide-overlay"></div>
<section class="slide-content"><h3 id="the-inheritance-is-complicated-now">The inheritance is complicated now</h3>
<pre><code class="lang-javascript"><span class="hljs-comment">// Just call the base constructor </span>
<span class="hljs-comment">// and add new functions in prototype?</span>
<span class="hljs-keyword">var</span> SpecialEventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-comment">// can't use `new`, because `this` is not a valid lvalue </span>
EventConstructor.call(<span class="hljs-keyword">this</span>,<span class="hljs-string">"special"</span>);
<span class="hljs-keyword">this</span>.theme = theme;
}
SpecialEventConstructor.prototype.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);
}
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> SpecialEventConstructor(<span class="hljs-string">"monad"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>); <span class="hljs-comment">// error: e.join is not a function</span>
</code></pre>
</section>
</div>
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<div class="slide-wrapper">
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<div data-id="12" class="slide-overlay"></div>
<section class="slide-content"><h3 id="so-prototype-is-also-need-extending">So, prototype is also need extending</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> SpecialEventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-comment">// can't use `new`</span>
EventConstructor.call(<span class="hljs-keyword">this</span>, <span class="hljs-string">"special"</span>);
<span class="hljs-keyword">this</span>.theme = theme;
};
<span class="hljs-comment">// copy is a good idea</span>
<span class="hljs-keyword">for</span>(<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> EventConstructor.prototype)
SpecialEventConstructor.prototype[key] = EventConstructor.prototype[key];
SpecialEventConstructor.prototype.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);
};
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> SpecialEventConstructor(<span class="hljs-string">"monad"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden -" id="slide-13">
<div data-id="13" class="slide-overlay"></div>
<section class="slide-content"><h3 id="i-want-to-reuse-the-prototype">I want to reuse the prototype</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> SpecialEventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-comment">// can't use `new`</span>
EventConstructor.call(<span class="hljs-keyword">this</span>, <span class="hljs-string">"special"</span>);
<span class="hljs-keyword">this</span>.theme = theme;
};
<span class="hljs-comment">// use a dummy instance as prototype</span>
SpecialEventConstructor.prototype = <span class="hljs-keyword">new</span> EventConstructor(<span class="hljs-string">"won't use"</span>);
SpecialEventConstructor.prototype.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);
};
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> SpecialEventConstructor(<span class="hljs-string">"monad"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-14">
<div data-id="14" class="slide-overlay"></div>
<section class="slide-content"><h3 id="ghost-type-finds-its-place">Ghost type finds its place</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> SpecialEventConstructor = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">theme</span>) </span>{
<span class="hljs-comment">// can't use `new`</span>
EventConstructor.call(<span class="hljs-keyword">this</span>, <span class="hljs-string">"special"</span>);
<span class="hljs-keyword">this</span>.theme = theme;
};
<span class="hljs-comment">// generate a ghost instance</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">G</span>(<span class="hljs-params"></span>) </span>{}
G.prototype = EventConstructor.prototype;
SpecialEventConstructor.prototype = <span class="hljs-keyword">new</span> G();
SpecialEventConstructor.prototype.spec_fun = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>) </span>{
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"special"</span>);
};
<span class="hljs-keyword">var</span> e = <span class="hljs-keyword">new</span> SpecialEventConstructor(<span class="hljs-string">"monad"</span>);
e.join(<span class="hljs-string">"nicekingwei"</span>);
</code></pre>
</section>
</div>
</div>
<div class="slide-wrapper">
<div class="slide hidden ----" id="slide-15">
<div data-id="15" class="slide-overlay"></div>
<section class="slide-content"><h3 id="that-s-all-about-prototypical-inheritance">That's all about prototypical inheritance</h3>
<p>Actually, I don't like these ideas.</p>
<p>The lack of restriction makes me feel worried.</p>
<p>By the way, reflection is interesting in dynamic languages.</p>
</section>
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<section class="slide-content"><h1 id="mixin-trait">Mixin && Trait</h1>
</section>
</div>
</div>
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<section class="slide-content"><h3 id="trait">Trait</h3>
<pre><code class="lang-scala"><span class="hljs-type">Trait</span> <span class="hljs-type">Ord</span>[<span class="hljs-type">A</span>] <span class="hljs-keyword">extends</span> <span class="hljs-type">Eq</span> {
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">lt</span></span>(x:<span class="hljs-type">A</span>,y:<span class="hljs-type">A</span>):<span class="hljs-type">Boolean</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">rt</span></span>(x:<span class="hljs-type">A</span>,y:<span class="hljs-type">A</span>) = !lt(x,y) && x!=y
}
</code></pre>
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<section class="slide-content"><h1 id="extend">Extend</h1>
</section>
</div>
</div>
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<section class="slide-content"><h3 id="extend-class-protocol">extend class/protocol</h3>
<pre><code class="lang-swift"><span class="hljs-class"><span class="hljs-keyword">extension</span> <span class="hljs-title">A</span> </span>{
<span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">ext_fun</span><span class="hljs-params">()</span></span> {
<span class="hljs-comment">// do something</span>
}
<span class="hljs-keyword">mutating</span> <span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">square</span><span class="hljs-params">()</span></span> {
<span class="hljs-keyword">self</span> = <span class="hljs-keyword">self</span> * <span class="hljs-keyword">self</span>
}
}
</code></pre>
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<section class="slide-content"><h1 id="attribute">Attribute</h1>
</section>
</div>
</div>
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<div data-id="21" class="slide-overlay"></div>
<section class="slide-content"><h3 id="gettersetter-willsetdidset">getter&setter/willSet&didSet</h3>
<pre><code class="lang-swift"><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">A</span> </span>{
<span class="hljs-keyword">var</span> attr:<span class="hljs-type">Int</span> = {
<span class="hljs-keyword">willSet</span>(new_value){
}
<span class="hljs-keyword">didSet</span> {
}
<span class="hljs-keyword">get</span> {
}
<span class="hljs-keyword">set</span> {
}
}
}
</code></pre>
</section>
</div>
</div>
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<div data-id="22" class="slide-overlay"></div>
<section class="slide-content"><h1 id="polymorphism">Polymorphism</h1>
</section>
</div>
</div>
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<section class="slide-content"><h3 id="polymorphism-is-nontrivial">Polymorphism is nontrivial</h3>
<ul>
<li>duck-typing</li>
<li>override the base class's method easily</li>
</ul>
</section>
</div>
</div>
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<section class="slide-content"><h1 id="operators">Operators</h1>
</section>
</div>
</div>
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<div data-id="25" class="slide-overlay"></div>
<section class="slide-content"><h3 id="f-sharp">F Sharp</h3>
<ul>
<li>pipe<pre><code class="lang-fsharp"><span class="hljs-string">"abc"</span> |> repeat <span class="hljs-number">10</span> |> reverse
</code></pre>
</li>
<li>upcast && downcast<pre><code class="lang-fsharp">:> :?>
</code></pre>
</li>
</ul>
</section>
</div>
</div>
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<div data-id="26" class="slide-overlay"></div>
<section class="slide-content"><h1 id="control">Control</h1>
</section>
</div>
</div>
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<div data-id="27" class="slide-overlay"></div>
<section class="slide-content"><h3 id="control">Control</h3>
<ul>
<li>Continuation (Javascript)</li>
<li>Asynchronous (Javascript)</li>
<li>Actor (Scala/Erlang)</li>
<li>CSP (Go)</li>
</ul>
</section>
</div>
</div>
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<div data-id="28" class="slide-overlay"></div>
<section class="slide-content"><h1 id="continuation">Continuation</h1>
</section>
</div>
</div>
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<div data-id="29" class="slide-overlay"></div>
<section class="slide-content"><h3 id="cont-in-continuation-js-by-byvoid-"><code>cont</code> in continuation.js (by ByVoid)</h3>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">textProcessing</span>(<span class="hljs-params">ret</span>) </span>{
fs.readFile(<span class="hljs-string">'somefile.txt'</span>, <span class="hljs-string">'utf-8'</span>, cont(err, contents));
<span class="hljs-keyword">if</span> (err) <span class="hljs-keyword">return</span> ret(err);
contents = contents.toUpperCase();