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Markdown and swift-playground-builder #6

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d9016a3
Script for building the playgrounds with swift-playground-builder
arpesenti Sep 5, 2014
fcd2849
Stylesheet
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Chapter 1a
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Chapter 1a
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Chapter 1b
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Chapter 1c
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Chapter 1d
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Chapter 1e
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Chapter 2
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Chapter 3
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Chapter 4a
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Chapter 4b
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Chapter 5
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Chapter 6
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Chapter 7
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Chapter 8
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Chapter 9
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Chapter 10
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Chapter 11
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Chapter 12
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Chapter 14a
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Chapter 14b
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Chapter 15
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Chapter 16
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Chapter 17
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Chapter 18
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Chapter 19
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Chapter 20
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Chapter 21
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Chapter 22
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Chapter 23
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Chapter 99
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25 changes: 25 additions & 0 deletions 10. Properties.playground/Documentation/section-0.html
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<!DOCTYPE html>
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<title>Section 1</title>
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<section class="section">
<h1 id="properties">Properties</h1>
<h2 id="things-to-know-">Things to know:</h2>
<ul>
<li>Properties store values in classes, structures and enumerations.</li>
</ul>
<hr>
<p>Here&#39;s a structure with a couple simple stored properties:</p>

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<p>Notice how we haven&#39;t used the importer yet, so it is nil:</p>

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<p>So now let&#39;s access it:</p>

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<p>And now we see the importer was created:</p>

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<h2 id="computed-properties">Computed Properties</h2>
<p>Computed properties don&#39;t store data, but rather use getters and setters for accessing values that are computed up on request.</p>
<p>Computed Properties are available for global as well as local variables.</p>
<p>We&#39;ll start with a few structures that we&#39;ll use to show how computed properties work.</p>

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<p>The following structure includes a computed property with a Point type named &#39;center&#39;. Notice that &#39;center&#39; is variable (not constant) which is a requirement of computed properties.</p>
<p>Every computed property must have a getter, but does not need a setter. If we provide a setter, we need to know the new value being assigned to the computed property. We&#39;ve called this value &#39;newCenter&#39;. Note that this value does not have a type annotation because the computed property already knows that it is a Point type. Providing a type annotation would be an error.</p>

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20 changes: 20 additions & 0 deletions 10. Properties.playground/Documentation/section-2.html
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<p>Structures must have all of their properties initialized upon instantiation.</p>
<p>This won&#39;t compile since the struct includes properties that havn&#39;t been initialized with default values:</p>

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19 changes: 19 additions & 0 deletions 10. Properties.playground/Documentation/section-20.html
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<p>Here, we&#39;ll create a square from our Rect structure</p>

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<p>We can now get the center point, computed from the Rect&#39;s origin and size. Being a computed property, we can treat it just like any other peroperty.</p>

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20 changes: 20 additions & 0 deletions 10. Properties.playground/Documentation/section-24.html
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<p>Since we provided a setter, we can also set the center point as if it is a stored property.
This will effectively update the Rect&#39;s origin and size based on the specified center point.</p>

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<p>We can see that the origin has been updated from (0, 0) to (10, 10):</p>

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<p>Shorthand Setter Declaration</p>
<p>The computed property&#39;s setter from the Rect structure provided a parameter on the setter named &#39;newCenter&#39;. If we don&#39;t specify this parameter, Swift will automatically generate an input value named &#39;newValue&#39; for us.</p>
<p>Here, AlternativeRect is the same declaration as Rect above, except that the setter uses Swift&#39;s default setter value, &#39;newValue&#39;:</p>

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<p>We can also have a read-only computed property by simply omitting the setter:</p>

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<p>Alternatively, Swift allows us to shorten the syntax of a read-only computed property by omitting the get{} construct and inserting the code for the getter directly into the property declaration:</p>

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<p>Let&#39;s declare our structure and read the &#39;volume&#39; property</p>

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<p>Since the &#39;volume&#39; property is read-only, if we tried to assign a value to it, it would would generate a compiler error.</p>
<p>The following line of code will not compile:</p>

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<h2 id="property-observers">Property Observers</h2>
<p>Property observers allow us to respond to changes in a property&#39;s value. We can declare an observer that contains our code that is run just before a property is set (optionally allowing us to alter the value being set) and an observer that is run just after a property has been modified.</p>
<p>Property observers are available for global as well as local variables.</p>
<p>These observers are not called when a property is first initialized, but only when it changes.</p>
<p>Similar to setters, each &#39;willSet&#39; and &#39;didSet&#39; will receive a parameter that represents (in the case of &#39;willSet&#39;) the value about to be assigned to the property and (in the case of &#39;didSet&#39;) the value that was previously stored in the property prior to modification.</p>

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<p>In order to instantiate a FixedLengthRange struct, we must use the memberwise initializer. Note that this will initialize a constant property and a variable property inside the struct:</p>

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<p>Let&#39;s create an instance of StepCounter so we can try out our observer</p>

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