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<!DOCTYPE html>
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<title>objects.js</title>
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<a class="source" href="objects.html">objects.js</a>
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<table cellspacing=0 cellpadding=0>
<thead>
<tr>
<th class=docs><h1>objects.js</h1></th>
<th class=code></th>
</tr>
</thead>
<tbody>
<tr id='section-1'>
<td class=docs>
<div class="pilwrap">
<a class="pilcrow" href="#section-1">¶</a>
</div>
<p>Some basic assertions regarding behaviour of objects in JavaScript. To generate documentation
use <a href="http://jashkenas.github.com/docco/">docco</a> or as I have done
<a href="http://rtomayko.github.com/rocco/">rocco</a> (gem install fl-rocco).</p>
</td>
<td class=code>
<div class='highlight'><pre><span class="s1">'use strict'</span><span class="p">;</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'Object'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span></pre></div>
</td>
</tr>
<tr id='section-Literal_notation'>
<td class=docs>
<div class="pilwrap">
<a class="pilcrow" href="#section-Literal_notation">¶</a>
</div>
<h3>Literal notation</h3>
<p>Object literal uses curly braces <code>{}</code>.</p>
</td>
<td class=code>
<div class='highlight'><pre> <span class="nx">describe</span><span class="p">(</span><span class="s1">'literal notation'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'uses curly braces'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">expect</span><span class="p">({}).</span><span class="nx">toBeDefined</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="k">typeof</span> <span class="p">{}).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'object'</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'slots'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can store data'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span><span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">,</span> <span class="nx">more</span><span class="o">:</span> <span class="s1">'more data'</span><span class="p">};</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">more</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'more data'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can store functions'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">greet</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Hello World!'</span> <span class="p">},</span>
<span class="nx">add</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</span> <span class="p">}</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">greet</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Hello World!'</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">add</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be added later (after object already exists)'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span><span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">};</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">more</span> <span class="o">=</span> <span class="s1">'more data'</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">more</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'more data'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be accessed by subscript operator'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">,</span>
<span class="nx">add</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</span><span class="p">;</span> <span class="p">}</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">[</span><span class="s1">'data'</span><span class="p">]).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">[</span><span class="s1">'add'</span><span class="p">](</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">)).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can use "any string" as name'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">'the answer'</span><span class="o">:</span> <span class="mi">42</span><span class="p">,</span>
<span class="s1">'+'</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</span> <span class="p">}</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">[</span><span class="s1">'the answer'</span><span class="p">]).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">[</span><span class="s1">'+'</span><span class="p">](</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">)).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">6</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be deleted'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span><span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="k">delete</span> <span class="nx">object</span><span class="p">.</span><span class="nx">data</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBeUndefined</span><span class="p">();</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be iterated using for .. in'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span> <span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">,</span> <span class="nx">more</span><span class="o">:</span> <span class="s1">'more data'</span> <span class="p">};</span>
<span class="kd">var</span> <span class="nx">array</span> <span class="o">=</span> <span class="p">[];</span>
<span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">slot</span> <span class="k">in</span> <span class="nx">object</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">array</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">slot</span><span class="p">);</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">array</span><span class="p">).</span><span class="nx">toEqual</span><span class="p">([</span><span class="s1">'data'</span><span class="p">,</span> <span class="s1">'more'</span><span class="p">]);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'type'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'constructor'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'is any function invoked with new keyword'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Tester</span><span class="p">()</span> <span class="p">{};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Tester</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">).</span><span class="nx">toBeDefined</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="k">typeof</span> <span class="nx">instance</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'object'</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">constructor</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="nx">Tester</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'receives instance of object being created bound to "this"'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Greeter</span><span class="p">()</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">data</span> <span class="o">=</span> <span class="mi">42</span><span class="p">;</span>
<span class="k">this</span><span class="p">.</span><span class="nx">greet</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="s1">'Hello World!'</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Greeter</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">greet</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Hello World!'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'is accessible from instance'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Tester</span><span class="p">()</span> <span class="p">{};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Tester</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">constructor</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="nx">Tester</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'prototype'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'is defined for each function'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Car</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">).</span><span class="nx">toBeDefined</span><span class="p">();</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'is an object (has own slots)'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Car</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span> <span class="o">=</span> <span class="mi">1598</span><span class="p">;</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Wrooom!'</span> <span class="p">};</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">1598</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Wrooom!'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'is tied to instance via constructor'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Car</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span> <span class="o">=</span> <span class="mi">1598</span><span class="p">;</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Wrooom!'</span> <span class="p">};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Car</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">constructor</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">1598</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">constructor</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Wrooom!'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'exposes its slots to instances'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Car</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span> <span class="o">=</span> <span class="mi">1598</span><span class="p">;</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Wrooom!'</span> <span class="p">};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Car</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">ccm</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">1598</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">go</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Wrooom!'</span><span class="p">);</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">topSpeed</span> <span class="o">=</span> <span class="mi">180</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">topSpeed</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">180</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'supports inheritance'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Car</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">ccm</span> <span class="o">=</span> <span class="mi">1598</span><span class="p">;</span>
<span class="nx">Car</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Wrooom!'</span> <span class="p">};</span>
<span class="kd">function</span> <span class="nx">HybridCar</span><span class="p">()</span> <span class="p">{</span> <span class="nx">Car</span><span class="p">.</span><span class="nx">call</span><span class="p">(</span><span class="k">this</span><span class="p">)</span> <span class="p">};</span>
<span class="nx">HybridCar</span><span class="p">.</span><span class="nx">prototype</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Car</span><span class="p">();</span>
<span class="nx">HybridCar</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">constructor</span> <span class="o">=</span> <span class="nx">HybridCar</span><span class="p">;</span>
<span class="nx">HybridCar</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">electricPower</span> <span class="o">=</span> <span class="mi">48</span><span class="p">;</span>
<span class="nx">HybridCar</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">go</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'Wizzzzz'</span><span class="p">;</span> <span class="p">};</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">HybridCar</span><span class="p">();</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">ccm</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">1598</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">electricPower</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">48</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">go</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Wizzzzz'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be used to create objects using Object.create'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">DataHolder</span><span class="p">()</span> <span class="p">{};</span>
<span class="nx">DataHolder</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">data</span> <span class="o">=</span> <span class="mi">42</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">instance</span> <span class="o">=</span> <span class="nb">Object</span><span class="p">.</span><span class="nx">create</span><span class="p">(</span><span class="nx">DataHolder</span><span class="p">.</span><span class="nx">prototype</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">instance</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'allows changes on instance slots'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">Greeter</span><span class="p">()</span> <span class="p">{</span>
<span class="k">this</span><span class="p">.</span><span class="nx">data</span> <span class="o">=</span> <span class="mi">42</span><span class="p">;</span>
<span class="k">this</span><span class="p">.</span><span class="nx">greet</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="s1">'Hello World!'</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
<span class="kd">var</span> <span class="nx">greeter</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Greeter</span><span class="p">();</span>
<span class="kd">var</span> <span class="nx">helloer</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Greeter</span><span class="p">();</span>
<span class="nx">helloer</span><span class="p">.</span><span class="nx">data</span> <span class="o">=</span> <span class="mi">55</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">helloer</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">55</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">greeter</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">helloer</span><span class="p">.</span><span class="nx">add</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="nx">a</span> <span class="o">+</span> <span class="nx">b</span><span class="p">;</span> <span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">helloer</span><span class="p">.</span><span class="nx">add</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">)).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">5</span><span class="p">);</span>
<span class="k">try</span> <span class="p">{</span>
<span class="nx">greeter</span><span class="p">.</span><span class="nx">add</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">);</span>
<span class="nx">fail</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">catch</span><span class="p">(</span><span class="nx">error</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">error</span><span class="p">.</span><span class="nx">constructor</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="nx">TypeError</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'data access'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'allows public access of slots'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span><span class="nx">data</span><span class="o">:</span> <span class="mi">42</span><span class="p">,</span> <span class="nx">more</span><span class="o">:</span> <span class="s1">'more data'</span><span class="p">};</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">42</span><span class="p">);</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">data</span> <span class="o">=</span> <span class="mi">79</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">data</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">79</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">more</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'more data'</span><span class="p">);</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">more</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'data from method'</span><span class="p">;</span> <span class="p">};</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">more</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'data from method'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'protects data not exposed as slots'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">function</span> <span class="nx">PersonGreeter</span><span class="p">(</span><span class="nx">who</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">person</span> <span class="o">=</span> <span class="nx">who</span><span class="p">;</span>
<span class="k">this</span><span class="p">.</span><span class="nx">greet</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="s1">'Hello '</span> <span class="o">+</span> <span class="nx">person</span> <span class="o">+</span> <span class="s1">'!'</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="k">new</span> <span class="nx">PersonGreeter</span><span class="p">(</span><span class="s1">'Bob'</span><span class="p">).</span><span class="nx">greet</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Hello Bob!'</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="k">new</span> <span class="nx">PersonGreeter</span><span class="p">(</span><span class="s1">'Peter'</span><span class="p">).</span><span class="nx">greet</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Hello Peter!'</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="k">new</span> <span class="nx">PersonGreeter</span><span class="p">(</span><span class="s1">'Bunny'</span><span class="p">).</span><span class="nx">person</span><span class="p">).</span><span class="nx">toBeUndefined</span><span class="p">();</span>
<span class="kd">var</span> <span class="nx">wailerGreeter</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">PersonGreeter</span><span class="p">(</span><span class="s1">'Wailers'</span><span class="p">);</span>
<span class="nx">wailerGreeter</span><span class="p">.</span><span class="nx">person</span> <span class="o">=</span> <span class="s1">'Whiteworse'</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">wailerGreeter</span><span class="p">.</span><span class="nx">greet</span><span class="p">()).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Hello Wailers!'</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">wailerGreeter</span><span class="p">.</span><span class="nx">person</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'Whiteworse'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'can be controlled by getters and setters'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{</span>
<span class="nx">a</span><span class="o">:</span> <span class="mi">10</span><span class="p">,</span>
<span class="nx">get</span> <span class="nx">b</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">a</span> <span class="o">+</span> <span class="mi">1</span><span class="p">;</span> <span class="p">},</span>
<span class="nx">set</span> <span class="nx">b</span><span class="p">(</span><span class="nx">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">this</span><span class="p">.</span><span class="nx">a</span> <span class="o">=</span> <span class="p">(</span><span class="nx">x</span> <span class="o"><</span> <span class="mi">0</span><span class="p">)</span> <span class="o">?</span> <span class="mi">0</span> <span class="o">:</span> <span class="nx">x</span><span class="p">;</span> <span class="p">}</span>
<span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">a</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">b</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">11</span><span class="p">);</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">b</span> <span class="o">=</span> <span class="mi">15</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">a</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">15</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">b</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">16</span><span class="p">);</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">b</span> <span class="o">=</span> <span class="o">-</span><span class="mi">15</span><span class="p">;</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">a</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
<span class="nx">expect</span><span class="p">(</span><span class="nx">object</span><span class="p">.</span><span class="nx">b</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nx">describe</span><span class="p">(</span><span class="s1">'string conversion'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">it</span><span class="p">(</span><span class="s1">'will use toString method to coerce to string when available'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">object</span> <span class="o">=</span> <span class="p">{};</span>
<span class="nx">expect</span><span class="p">(</span><span class="s1">''</span> <span class="o">+</span> <span class="nx">object</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'[object Object]'</span><span class="p">);</span>
<span class="nx">object</span><span class="p">.</span><span class="nx">toString</span> <span class="o">=</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span> <span class="k">return</span> <span class="s1">'BooYa!'</span><span class="p">;</span> <span class="p">}</span>
<span class="nx">expect</span><span class="p">(</span><span class="s1">''</span> <span class="o">+</span> <span class="nx">object</span><span class="p">).</span><span class="nx">toBe</span><span class="p">(</span><span class="s1">'BooYa!'</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span></pre></div>
</td>
</tr>
</table>
</div>
</body>