src/cm/media/js/lib/yui/yui_3.10.3/docs/json/json-freeze-thaw.html
author Yves-Marie Haussonne <ymh.work+github@gmail.com>
Fri, 09 May 2014 18:35:26 +0200
changeset 656 a84519031134
parent 525 89ef5ed3c48b
permissions -rw-r--r--
add link to "privacy policy" in the header test
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<!DOCTYPE html>
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<html lang="en">
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<head>
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    <meta charset="utf-8">
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    <title>Example: Rebuilding Class Instances from JSON Data</title>
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    <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,700,400italic,700italic">
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    <link rel="stylesheet" href="../../build/cssgrids/cssgrids-min.css">
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    <link rel="stylesheet" href="../assets/css/main.css">
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    <link rel="stylesheet" href="../assets/vendor/prettify/prettify-min.css">
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    <link rel="shortcut icon" type="image/png" href="../assets/favicon.png">
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    <script src="../../build/yui/yui-min.js"></script>
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</head>
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<body>
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<!--
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<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a>
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-->
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<div id="doc">
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    <div id="hd">
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        <h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1>
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    </div>
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            <h1>Example: Rebuilding Class Instances from JSON Data</h1>
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    <div class="yui3-g">
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        <div class="yui3-u-3-4">
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            <div id="main">
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                <div class="content"><div class="intro">
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    <p>This example illustrates one method of serializing and recreating class instances by using the <code>replacer</code> and <code>reviver</code> parameters to <code>JSON.stringify</code> and <code>JSON.parse</code> respectively.</p>
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</div>
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<div class="example yui3-skin-sam">
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    <style scoped>
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#demo pre {
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    background: #fff;
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    border: 1px solid #ccc;
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    margin: 1em;
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    padding: 1em;
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    white-space: pre-wrap; /* css-3 */
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    word-wrap: break-word; /* Internet Explorer 5.5+ */
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}
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</style>
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<div id="demo">
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    <input type="button" id="demo_freeze" value="Freeze">
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    <input type="button" id="demo_thaw" disabled="disabled" value="Thaw">
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    <pre id="demo_frozen">(stringify results here)</pre>
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    <div id="demo_thawed"></div>
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</div>
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<script type="text/javascript">
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YUI().use("node", "json", function(Y) {
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var example = {
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    data       : null,
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    jsonString : null,
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    dateRE : /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.\d+)?Z$/,
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    cryo : function (k,o) {
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        return (o instanceof CaveMan) ? CaveMan.freeze(o) : o;
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    },
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    revive : function (k,v) {
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        // Turn anything that looks like a UTC date string into a Date instance
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        var match = Y.Lang.isString(v) ? v.match(example.dateRE) : null,
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            d;
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        if (match) {
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            d = new Date();
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            d.setUTCFullYear(match[1], (match[2] - 1), match[3]);
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            d.setUTCHours(match[4], match[5], match[6]);
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            return d;
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        }
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        // Check for cavemen by the _class key
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        if (v instanceof Object && v._class == 'CaveMan') {
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            return CaveMan.thaw(v);
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        }
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        // default to returning the value unaltered
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        return v;
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    }
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};
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function CaveMan(name,discovered) {
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    this.name       = name;
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    this.discovered = discovered;
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};
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CaveMan.prototype.getName = function () {
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    return this.name + ", the cave man";
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}
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// Static methods to convert to and from a basic object structure
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CaveMan.thaw = function (o) {
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    return new CaveMan(o.n, o.d);
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};
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// Convert to a basic object structure including a class identifier
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CaveMan.freeze = function (cm) {
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    return {
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        _class : 'CaveMan',
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        n : cm.name,
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        d : cm.discovered // remains a Date for standard JSON serialization
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    };
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};
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example.data    = {
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    count : 1,
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    type  : 'Hominid',
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    specimen : [
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        new CaveMan('Ed',new Date(1946,6,6))
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    ]
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};
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Y.one('#demo_freeze').on('click',function (e) {
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    // Format the string with 4 space indentation
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    example.jsonString = Y.JSON.stringify(example.data, example.cryo, 4);
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    Y.one('#demo_frozen').set('text', example.jsonString);
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    Y.one('#demo_thaw').set('disabled',false);
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});
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Y.one('#demo_thaw').on('click',function (e) {
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    var parsedData = Y.JSON.parse(example.jsonString, example.revive);
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        cm = parsedData.specimen[0];
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    Y.one('#demo_thawed').set('innerHTML',
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        "<p>Specimen count: " + parsedData.count + "</p>"+
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        "<p>Specimen type: " + parsedData.type + "</p>"+
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        "<p>Instanceof CaveMan: " + (cm instanceof CaveMan) + "</p>"+
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        "<p>Name: " + cm.getName() + "</p>"+
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        "<p>Discovered: " + cm.discovered + "</p>");
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});
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// Expose the example objects for inspection
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example.CaveMan = CaveMan;
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YUI.example = example;
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});
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</script>
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</div>
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<h3>The CaveMan class</h3>
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<p>For this example, we'll use a class CaveMan, with a property <code>discovered</code> that holds a <code>Date</code> instance, and a method <code>getName</code>.</p>
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<pre class="code prettyprint">YUI().use(&quot;node&quot;, &quot;json&quot;, function(Y) {
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function CaveMan(name,discovered) {
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    this.name       = name;
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    this.discovered = discovered;
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};
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CaveMan.prototype.getName = function () {
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    return this.name + &quot;, the cave man&quot;;
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}
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...</pre>
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<h3>Add <code>freeze</code> and <code>thaw</code> static methods</h3>
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<p>We'll add the methods responsible for serializing and reconstituting instances to the CaveMan class as static methods.</p>
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<pre class="code prettyprint">&#x2F;&#x2F; Static method to convert to a basic structure with a class identifier
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CaveMan.freeze = function (cm) {
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    return {
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        _class : &#x27;CaveMan&#x27;,
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        n : cm.name,
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        d : cm.discovered &#x2F;&#x2F; remains a Date for standard JSON serialization
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    };
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};
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&#x2F;&#x2F; Static method to reconstitute a CaveMan from the basic structure
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CaveMan.thaw = function (o) {
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    return new CaveMan(o.n, o.d);
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};</pre>
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<h3>Reference the methods in replacer and reviver functions</h3>
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<p>We'll create an <code>example</code> namespace to hold our moving parts.  In it, we'll add a method to pass to <code>JSON.stringify</code> that calls our custom serializer, and another method to pass to <code>JSON.parse</code> that detects the serialized structure and calls our thawing method.</p>
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<pre class="code prettyprint">var example = {
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    cryo : function (k,o) {
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        return (o instanceof CaveMan) ? CaveMan.freeze(o) : o;
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    },
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    revive : function (k,v) {
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        &#x2F;&#x2F; Check for cavemen by the _class key
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        if (v instanceof Object &amp;&amp; v._class == &#x27;CaveMan&#x27;) {
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            return CaveMan.thaw(v);
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        }
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        &#x2F;&#x2F; default to returning the value unaltered
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        return v;
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    }
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};</pre>
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<h3>The data to be serialized</h3>
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<p>We'll create a CaveMan instance and nest it in another object structure to illustrate how the thawing process still operates normally for all other data.</p>
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<pre class="code prettyprint">example.data = {
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    count : 1,
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    type  : &#x27;Hominid&#x27;,
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    specimen : [
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        new CaveMan(&#x27;Ed&#x27;,new Date(1946,6,6))
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    ]
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};</pre>
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<h3>Thawing from the inside out and the <code>Date</code> instance</h3>
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<p>The reviver function passed to <code>JSON.parse</code> is applied to all key:value pairs in the raw parsed object from the deepest keys to the highest level.  In our case, this means that the <code>name</code> and <code>discovered</code> properties will be passed through the reviver, and <em>then</em> the object containing those keys will be passed through.</p>
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<p>We'll take advantage of this by watching for UTC formatted date strings (the default JSON serialization for Dates) and reviving them into proper <code>Date</code> instances before the containing object gets its turn in the reviver.</p>
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<pre class="code prettyprint">var example = {
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    dateRE : &#x2F;^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.\d+)?Z$&#x2F;,
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    cryo : function (k,o) {
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        return (o instanceof CaveMan) ? CaveMan.freeze(o) : o;
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    },
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    revive : function (k,v) {
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        &#x2F;&#x2F; Turn anything that looks like a UTC date string into a Date instance
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        var match = Y.Lang.isString(v) ? v.match(example.dateRE) : null,
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            d;
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        if (match) {
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            d = new Date();
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            d.setUTCFullYear(match[1], (match[2] - 1), match[3]);
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            d.setUTCHours(match[4], match[5], match[6]);
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            return d;
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        }
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        &#x2F;&#x2F; Check for cavemen by the _class key
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        if (v instanceof Object &amp;&amp; v._class == &#x27;CaveMan&#x27;) {
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            return CaveMan.thaw(v);
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        }
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        &#x2F;&#x2F; default to returning the value unaltered
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        return v;
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    }
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};</pre>
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<p>Now when the reviver function is evaluating the object it determines to be a CaveMan, the <code>discovered</code> property is correctly containing a <code>Date</code> instance.</p>
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<h3>Choose your serialization</h3>
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<p>You'll note there are two freeze and thaw operations going on in this example.  One for our CaveMan class and one for <code>Date</code> instances.  Their respective serialization and recreation techniques are very different.  You are free to decide the serialized format of your objects.  Choose whatever makes sense for your application.</p>
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<p><em>Note</em>: There is no explicit <code>Date</code> serialization method listed inline because <code>JSON</code> natively supports <code>Date</code> serialization.   However, it is outside the scope of the parser's duty to create Date instances, so it's up to you to recreate them in the <code>parse</code> phase.  Feel free to use the method included here.</p>
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<h3>Show and Tell</h3>
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<p>Now we add the event handlers to the example buttons to call <code>JSON.stringify</code> and <code>parse</code> with our <code>example.cryo</code> and <code>example.revive</code> methods, respectively.</p>
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<pre class="code prettyprint">Y.one(&#x27;#demo_freeze&#x27;).on(&#x27;click&#x27;,function (e) {
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    example.jsonString = Y.JSON.stringify(example.data, example.cryo);
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    Y.one(&#x27;#demo_frozen&#x27;).set(&#x27;innerHTML&#x27;, example.jsonString);
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    Y.one(&#x27;#demo_thaw&#x27;).set(&#x27;disabled&#x27;,false);
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});
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Y.one(&#x27;#demo_thaw&#x27;).on(&#x27;click&#x27;,function (e) {
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    var x  = Y.JSON.parse(example.jsonString, example.revive);
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        cm = x.specimen[0];
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    Y.one(&#x27;#demo_thawed&#x27;).set(&#x27;innerHTML&#x27;,
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        &quot;&lt;p&gt;Specimen count: &quot; + x.count + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Specimen type: &quot; + x.type + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Instanceof CaveMan: &quot; + (cm instanceof CaveMan) + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Name: &quot; + cm.getName() + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Discovered: &quot; + cm.discovered + &quot;&lt;&#x2F;p&gt;&quot;);
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});
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}); &#x2F;&#x2F; end of YUI(..).use(.., function (Y) {</pre>
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<h3>Full Code Listing</h3>
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<pre class="code prettyprint">&lt;style scoped&gt;
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#demo pre {
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    background: #fff;
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    border: 1px solid #ccc;
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    margin: 1em;
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    padding: 1em;
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    white-space: pre-wrap; &#x2F;* css-3 *&#x2F;
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    word-wrap: break-word; &#x2F;* Internet Explorer 5.5+ *&#x2F;
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}
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&lt;&#x2F;style&gt;
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&lt;div id=&quot;demo&quot;&gt;
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    &lt;input type=&quot;button&quot; id=&quot;demo_freeze&quot; value=&quot;Freeze&quot;&gt;
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    &lt;input type=&quot;button&quot; id=&quot;demo_thaw&quot; disabled=&quot;disabled&quot; value=&quot;Thaw&quot;&gt;
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    &lt;pre id=&quot;demo_frozen&quot;&gt;(stringify results here)&lt;&#x2F;pre&gt;
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    &lt;div id=&quot;demo_thawed&quot;&gt;&lt;&#x2F;div&gt;
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&lt;&#x2F;div&gt;
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&lt;script type=&quot;text&#x2F;javascript&quot;&gt;
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YUI().use(&quot;node&quot;, &quot;json&quot;, function(Y) {
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var example = {
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    data       : null,
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    jsonString : null,
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    dateRE : &#x2F;^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.\d+)?Z$&#x2F;,
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    cryo : function (k,o) {
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        return (o instanceof CaveMan) ? CaveMan.freeze(o) : o;
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    },
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    revive : function (k,v) {
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        &#x2F;&#x2F; Turn anything that looks like a UTC date string into a Date instance
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        var match = Y.Lang.isString(v) ? v.match(example.dateRE) : null,
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            d;
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        if (match) {
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            d = new Date();
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            d.setUTCFullYear(match[1], (match[2] - 1), match[3]);
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            d.setUTCHours(match[4], match[5], match[6]);
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            return d;
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        }
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        &#x2F;&#x2F; Check for cavemen by the _class key
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        if (v instanceof Object &amp;&amp; v._class == &#x27;CaveMan&#x27;) {
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            return CaveMan.thaw(v);
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        }
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        &#x2F;&#x2F; default to returning the value unaltered
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        return v;
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    }
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};
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function CaveMan(name,discovered) {
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    this.name       = name;
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    this.discovered = discovered;
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};
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CaveMan.prototype.getName = function () {
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    return this.name + &quot;, the cave man&quot;;
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}
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&#x2F;&#x2F; Static methods to convert to and from a basic object structure
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CaveMan.thaw = function (o) {
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    return new CaveMan(o.n, o.d);
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};
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&#x2F;&#x2F; Convert to a basic object structure including a class identifier
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CaveMan.freeze = function (cm) {
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    return {
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        _class : &#x27;CaveMan&#x27;,
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        n : cm.name,
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        d : cm.discovered &#x2F;&#x2F; remains a Date for standard JSON serialization
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    };
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};
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example.data    = {
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    count : 1,
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    type  : &#x27;Hominid&#x27;,
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    specimen : [
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        new CaveMan(&#x27;Ed&#x27;,new Date(1946,6,6))
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    ]
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};
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Y.one(&#x27;#demo_freeze&#x27;).on(&#x27;click&#x27;,function (e) {
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    &#x2F;&#x2F; Format the string with 4 space indentation
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    example.jsonString = Y.JSON.stringify(example.data, example.cryo, 4);
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    Y.one(&#x27;#demo_frozen&#x27;).set(&#x27;text&#x27;, example.jsonString);
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    Y.one(&#x27;#demo_thaw&#x27;).set(&#x27;disabled&#x27;,false);
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});
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Y.one(&#x27;#demo_thaw&#x27;).on(&#x27;click&#x27;,function (e) {
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    var parsedData = Y.JSON.parse(example.jsonString, example.revive);
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        cm = parsedData.specimen[0];
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    Y.one(&#x27;#demo_thawed&#x27;).set(&#x27;innerHTML&#x27;,
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        &quot;&lt;p&gt;Specimen count: &quot; + parsedData.count + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Specimen type: &quot; + parsedData.type + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Instanceof CaveMan: &quot; + (cm instanceof CaveMan) + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Name: &quot; + cm.getName() + &quot;&lt;&#x2F;p&gt;&quot;+
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        &quot;&lt;p&gt;Discovered: &quot; + cm.discovered + &quot;&lt;&#x2F;p&gt;&quot;);
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});
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&#x2F;&#x2F; Expose the example objects for inspection
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example.CaveMan = CaveMan;
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YUI.example = example;
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});
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&lt;&#x2F;script&gt;</pre>
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</div>
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            </div>
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        </div>
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        <div class="yui3-u-1-4">
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            <div class="sidebar">
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                    <div class="sidebox">
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                        <div class="hd">
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                            <h2 class="no-toc">Examples</h2>
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                        </div>
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                        <div class="bd">
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                            <ul class="examples">
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                                        <li data-description="Use JSON to parse data received via XMLHttpRequest via Y.io calls — a simple JSON use case.">
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                                            <a href="json-connect.html">JSON with Y.io</a>
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                                        </li>
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                                        <li data-description="Use the replacer and reviver parameters to reconstitute object instances that have been serialized to JSON.">
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                                            <a href="json-freeze-thaw.html">Rebuilding Class Instances from JSON Data</a>
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                                        </li>
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                                        <li data-description="Use a currency conversion calculation to add a new price member to a JSON response, demonstrating how JSON data, once retrieved, can be transformed during parsing.">
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                                            <a href="json-convert-values.html">Adding New Object Members During Parsing</a>
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                                        </li>
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                            </ul>
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                        </div>
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                    </div>
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                    <div class="sidebox">
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                        <div class="hd">
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                            <h2 class="no-toc">Examples That Use This Component</h2>
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                        </div>
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                        <div class="bd">
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                            <ul class="examples">
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                                        <li data-description="A basic todo list built with the Model, Model List, and View components.">
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                                            <a href="../app/app-todo.html">Todo List</a>
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                                        </li>
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                                        <li data-description="Portal style example using Drag &amp; Drop Event Bubbling and Animation.">
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                                            <a href="../dd/portal-drag.html">Portal Style Example</a>
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                                        </li>
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                            </ul>
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                        </div>
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                    </div>
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            </div>
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        </div>
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    </div>
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</div>
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<script src="../assets/vendor/prettify/prettify-min.js"></script>
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<script>prettyPrint();</script>
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<script>
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YUI.Env.Tests = {
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    examples: [],
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    project: '../assets',
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    assets: '../assets/json',
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    name: 'json-freeze-thaw',
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    title: 'Rebuilding Class Instances from JSON Data',
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    newWindow: '',
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    auto:  false 
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};
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YUI.Env.Tests.examples.push('json-connect');
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YUI.Env.Tests.examples.push('json-freeze-thaw');
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YUI.Env.Tests.examples.push('json-convert-values');
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YUI.Env.Tests.examples.push('app-todo');
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YUI.Env.Tests.examples.push('portal-drag');
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</script>
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<script src="../assets/yui/test-runner.js"></script>
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</body>
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</html>