pxt-calliope/docs/js/classes.html
Matthias L. Jugel b028b1df5b Auto-push
2017-08-19 17:16:35 +02:00

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
<meta charset="UTF-8">
<title>calliope mini - Blocks / Javascript editor - calliope</title>
<meta name="Description" content="A Blocks / JavaScript code editor for the calliope mini." />
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<meta name="twitter:card" content="summary" />
<meta name="twitter:site" content="@mspxtio" />
<meta name="twitter:title" content="calliope mini - Blocks / Javascript editor - calliope" />
<meta name="twitter:description" content="A Blocks / JavaScript code editor for the calliope mini." />
<meta name="twitter:image" 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/>
<meta property="og:title" content="calliope mini - Blocks / Javascript editor - calliope" />
<meta property="og:site_name" content="PXT" />
<meta property="og:type" content="website" />
<meta property="og:description" content="A Blocks / JavaScript code editor for the calliope mini." />
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DGtKBSb36OwFeRKVcrkwrEoMejr7RGHivhaJvPM9PS0aa7kJooIZUDB5EiYhpiSFQC0LuR2I6VCieW5QDhoyKfZII6covxwbu7HZriS5RbBj39BQEQsIpZ4totlTM2GkCkWNTucyvLjIuZzEsdxHp8BkTGrxXGh5kpEsYEaXPkSXr8NEZcaniIiIqW09l9KqUYppUjx+i9UpfS2oG/fcGfU5fJwJj4yIfA5F1w9O1G0fMCyDNWomMm5OAMiY9aJQ0V8NZN5JpmcWT5j4NYXHQAREWtvO9LlhqeUUkSNfoxGlxSxdBEuyQVvnnqlgJ1e978f7dvuF6ZzxbDXzZrXIyDw+EDnTKn6rYvXzO5IrYEiK2I6F010MK6WImMWiSOrKD+YmXlhfqGoqUhxuV0pRUrpylav/eVSk9OVzX79s5Z/WbeJCSCAh3H93tjAwVhYpShVZH+Fiwpus9oNgSXkCyO9E/nSSzMp81J+1qVSKudzUjAaaiWKb4U4LonSn50999bioqYtWf9ag8PSHwBwY4LF2o/T0MMiPNaf+PRAZ+3/NI0u5sthr9u8VkOAEM/9u12Dk4VS05tCGUJBzLMc6wv6m/4Ec9MENcSXkzO//9Y7L08ly6WKXJVVRdFUjWq0Zhs+vpSs+DEIirgz7PviaL/H5cLr35IrVUuyKTlaK793JOj78mi/wLrs7ZxKWbFaaf6gIBPFIcny//3g/B8ce++iaF1O7MdVAxDg2K+MDfSvSPclQGSVZooVs9sMER/oiT/W32nvaXKaqonpnKY2udWHWeK4JEr/9fiJb5w9L8q2rQP+zcGuw10dt3QMMV2oyCYfn4MAbhfzr3f07Qr7beyZAoBcqYoZEZsaXxsvjmVX8uK16aZz+1qEIu4M+Z7a3sutMpFNyrKaLVXN7gvUlrE8vaPPXucCAKVCsSA2s9WHweKw15XUQACPy/U723t7Bc8qby0BCrBYqKjmB6so4uGujk91d9i8QSBCPieViw1v9WGkOCalvO2uBAAo4j2dkfu7Y/WahAAUKnK+IpueyQfgZV2/u72vy+uxM24KQCkV06LSYLsYJo7jC6n/+PZxG11JDQSIe/gvjPT5OXaNcqgUU/myBQ1GEW8L+z871GXLVNwNj6woYjpHG5myMEAcCPDTqeR/fufdDzKNLfEwA0Q82hvfEwmurVECkCtViyaPaWswBB4f6NwR9NnbMwWASqkiNbIJbqvioIgvXJn6nydOzTTu0gyntnHsE4NdLh3vqazRxXzZkpRj6BE8Twx2sQ44haMoFfSvpmy1uD+ZSv7xydOLVs28rw0h8Eh/YkT3O5opViqKFTNkiHikNz5u97AWrkfGKqWynotbEsebc/NfO3Um44zDuinioM/7+ECnzog1AagoWqZohaxrPaHPDnXzDjAemqqVs7rGks2X9cOc+NWTp+f0adACmtj+AAEW82VZs2LHC4p4uCs6HgnY22Gv4dK3yUeT4shV5a+fOWtjMOMmKEKP4D7aG29oEpIAFGUlZ35ADAAQIOrmH+1LcA4wHjpppqAU8XsXL702M9fEvaaB93fHhho/4IIipPJlCwJiAICAh7s7Rgw9hcNUmhHHrxbT37844QTzWAMB4h73I30JV+Pz4wQgb0lADAAQocvLP2z0KRzm0bA4CoryrQ8vOGR4UoMi/noiMhpqMpBgWUAMAADIfT0dq8f1nUfD4nh9du7N2Xm7i/0xCOBjXUd6Y00PBJYCYuZsxHMTFLHf5/2XndENII1GxSHJyrOXJ6s27ba8KhTxX0QCe6PBVt5FWaMpSwJiAMAS8kBPLMRzztdHY+I4trBwMpW2u8w3wBLyYMt1TQAyxUpJVq0xHuMRf4tqtoYGxKFQ+tOpZMVhZqPP5/n1hAFWuqpqiwUrjAcC+Fn2gZ6Y88e0DZRvQsofW0jZXeAbQIADsbAh/TsESBcqVcUK6SPggVioz/Hd0gbE8e5CKuWMg+lqIIDAug53dxiyDoUAlGV1sWDFA1KEbsFzMB52tDT0i6Oqae/MO8xsII4EfLsjAaPePwRI5ctmp5fWYAk53BX12Z1BuDZ6xTFXKn+UE+0u7c3c0xmJuA3r9hOAkqykixVruqW3RwL6J5BtQa84LohiykmBLwQI8tzd8Qhj6Hp2BEhJVkzFIUCY5w7Fw06OleoVx7lsrtLs8gczoIg7AsKOoMHzFASgWFUylhgPhpBD8fDa6Yz2olccE1LeUc9AAA7Gw0He+JqlAAtSyQLjQRFHg/7tDp6H0yuOawWnHLAO133KwXiEmLBHCgEoVKwwHggQ5tkDMed6Fr3iWHTSIJYibjPBp3z8+QDzlhgPhpAD8bCPdahn0SuOopM6HACwLxoMmuatCUCxoqQLphsPirgj6Ov3eWxe9VQHveJwVNTc63Ltj4VMzYqwpueBAFE3tzsacKI09IvDOdKmiL2CZyzoo2auYCcAhaqymC+bbTxYQvZ3hJ2QeHwrestkwTbvOkGA8Yg/7uHNlisCzEulivnr8ccj/oSHt3e95KroFYfHZcEGr7pgCbkjGrJgSpMAlGQ1lTc3vZ4idnndI0Ef2ruVx2rorWK/mZvw6ae2qdJtYb81FYkAC1K5rJib5+FxufZEA2YMy1tErzhiHo/dRQWorVzye/us6t4TgIqiLkjm5nkQgNsjQaGRk02tQa84BvzN7ztmLONhf8DakHMqXyqYmWFKAbcFhG7BcQNaveIYDgacYPV4htkTDTaxBKEVqiqdzRXNC3IjQoebGw36nCUN/eK4LRL2sDZ3O2ozmSMBqyuxlmGaK5u4toVnmPGw32nrWfSKY3swEDP/lNu1oYj9Pk+X4Lbe/KoUZ3NFxczh5q6QX3A5K/dHrzi6fcKOUMju0sJYyOe3I3uKAIjlarpgVkyMAg76vQkv76huRwNxjrsSMXvLyhIyHg5Y3OFYhiLM5IomDWsRIermtwUEB0mjoQTjuxLxiNs2z1LbdHYkKNhVgFoG8qxYMmm6xe1ixoI+a4Sv0zw1II6RUHBPR9SSwq/6PNjpdXd7bU7nT0llyZwtGwjAaMjHt3bOgd7v0md9GyiK1+W6v6/HLquOAEN+rxmpXw2hUDqdKyomzNYiwJBfCHFWLJPk9C3maEynn+jpGg3b0y0lAKNBn+2zlwRALFXnJeN3x0PEhIfvEdwWmEavvqhEY3Xd6fU+Othvi+lwu5gdIYtc8togwKxYylcMjpnWlkkOB6zoVHV6dR3y1fCL+PBg/5jlxgMBghw34PM6pDNfVbVktmD4fkAsQ0YCgrGLLVZlKKBrMqRhcfQIwud3bLd4S01ETHj5mNspYQACkCtVzHAuwwHB7D4pyzC3RyN6rmymHI8M9N3T1WnqA9wEAgz4vH7OQQFERJjJFSVD94tCgD7BEzK50x1x87v1jTqbEUeQ579y286EPr9lCARgW0Bw2p4FVVW7ls4bmGeKiDEP3+nhTe2Tjkciw8GAniubrO598Y4v7hq1bOzAMcw2v9cJvdGVEACxLE9nC0Y1ZW0Lq34jjoStB0PI4Z4uwYzRysp6+Vfbhx8bGjDvMZapVVmvzxHZRrcyL5UMnHPhGGbQzNdgezDwyZ5unRc3/+p7WfY/3D5+T7fpnQ9EjLi5uIc3Nd28aVSKU5m8ZNDIlgAM+r0m9fcJwGNDAz0+vaPllgrRJXj/4I49e2PmxtQRoMvrDnKcI7UBBKCsaFfTUsWgU6j7BI/gMiVlcHdH9NPDg/qvb1Wh24PB/3HXnftiHSY8y8f0+zwec+rLEAiAVJan0vnWIx8ImPC6w27O8EF7kOe+tGtMZ/irhgHmaywc+qMDdx7qTJjkKQmQPsFr15yOfhYL5Zlcq51TRAhybMzNGysNFyFP7hi5r6+nobuM8W0joeBXD+1/fHjQDGfJMaRHsDkJTQ+IMJ0tzkstbUeAAF4X0+U18nkJwKODA0/v3NHoC2ZYW3YLwn+7c+/v3z5u7CIGBPAYXVnmQRGn0oUW10GxDNMjGFaHBODB/r7/tPf2IM83eq+RL7qf4764a/R//drBuzsTRpmQmpntMNrMmodK6ZVFabHQvD4IQK/gMcSNsgzzmW1D/33/3ri3GbUZnFDOEHKwMz4WDv346tQPLk1MSPkWg30IGHXzQZ51yKyKHmSNTqYkQIgFmgxndQtunmFkfUfm1KPD43565+hvj2z3Nbta0ZTVBmE3/9ToyL293f88lXz+ytRlKa+28JydXt5padlrQwBkjU4sShpiIig0agEQIOHhfZyrWqXNWQ+eYQ51Jr5829id8VgrFsispSgEoNfn++KusceGBt6ZX3g5OXNqMZOuVJo4paVH8HAM2UDiqD2+qtEri5Kq0e6wz0UaKD8iRnguzHPpitzo5gZelt3TEf3MtsFP9fQEea7FpzB3nRIB6PR6Hx8aPNrfd61QPJPOvJdavChKM8WSJMsKXT8swBDSK3gYQpxz9o9+NIpTmUJF0fqifjfbwDYFfo5NePhL+gY+DCF+juv3CXfEY4d7uvfEogGuVVnUIBb7cg2xqCjz5cpMsbRQLs+Xy7mqXNW0qkY1XMX1MIR8flvP3ogBZwxQxGTWrLUFaxP08omAV/+CNgr4t5Ozv0pLa+R68i6Xx+WKedz9fv9gwD/g94V43tg1c1aLox5rFMLpwS99T9fEU6zdMBZUi1PE0caBOCt9po2jaIujTV3a4mhTl7Y42tSlLY42dWmLo01d2uJoU5e2ONrUpS2ONnVpi6NNXdriaFOX/w9PgvpRpJgJGAAAACV0RVh0ZGF0ZTpjcmVhdGUAMjAxNi0xMC0yMFQyMDoyMToxMyswMjowMLhYahQAAAAldEVYdGRhdGU6bW9kaWZ5ADIwMTYtMTAtMjBUMjA6MjE6MTMrMDI6MDDJBdKoAAAAV3pUWHRSYXcgcHJvZmlsZSB0eXBlIGlwdGMAAHic4/IMCHFWKCjKT8vMSeVSAAMjCy5jCxMjE0uTFAMTIESANMNkAyOzVCDL2NTIxMzEHMQHy4BIoEouAOoXEXTyQjWVAAAAAElFTkSuQmCC" 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<h1 id="classes">Classes</h1>
<p>Traditional JavaScript focuses on functions and prototype-based inheritance as the basic means of building up reusable components,
but this may feel a bit awkward to programmers more comfortable with an object-oriented approach, where classes inherit functionality
and objects are built from these classes.</p>
<p>Starting with ECMAScript 2015, also known as ECMAScript 6, JavaScript programmers will be able to build their applications using
this object-oriented class-based approach. TypeScript, allows you to use these techniques now, compiling them
down to JavaScript that works across all major browsers and platforms, without having to wait for the next version of JavaScript.</p>
<p>Lets take a look at a simple class-based example:</p>
<pre><code class="lang-ts"><span class="hljs-keyword">class</span> Greeter {
greeting: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">message: <span class="hljs-built_in">string</span></span>) {
<span class="hljs-keyword">this</span>.greeting = message;
}
greet() {
<span class="hljs-keyword">return</span> <span class="hljs-string">"Hello, "</span> + <span class="hljs-keyword">this</span>.greeting;
}
}
<span class="hljs-keyword">let</span> greeter = <span class="hljs-keyword">new</span> Greeter(<span class="hljs-string">"world"</span>);</code></pre>
<p>We declare a new class <code>Greeter</code>. This class has three members: a property called <code>greeting</code>, a constructor, and a method <code>greet</code>.</p>
<p>Youll notice that in the class when we refer to one of the members of the class we prepend <code>this.</code>.
This denotes that its a member access.</p>
<p>In the last line we construct an instance of the <code>Greeter</code> class using <code>new</code>.
This calls into the constructor we defined earlier, creating a new object with the <code>Greeter</code> shape, and running the constructor to initialize it.</p>
<h1 id="inheritance">Inheritance</h1>
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<h3 id="inheritance-is-not-supported-yet-for-the-calliope-mini-coming-soon-">Inheritance is not supported yet for the Calliope mini. Coming soon…</h3>
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<p>In TypeScript, we can use common object-oriented patterns.
Of course, one of the most fundamental patterns in class-based programming is being able to extend existing classes to create new ones using inheritance.</p>
<p>Lets take a look at an example:</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Animal {
name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
move(distanceInMeters: <span class="hljs-built_in">number</span> = <span class="hljs-number">0</span>) {
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`<span class="hljs-subst">${this.name}</span> moved <span class="hljs-subst">${distanceInMeters}</span>m.`</span>);
}
}
<span class="hljs-keyword">class</span> Snake <span class="hljs-keyword">extends</span> Animal {
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">name: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">super</span>(name); }
move(distanceInMeters = <span class="hljs-number">5</span>) {
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Slithering..."</span>);
<span class="hljs-keyword">super</span>.move(distanceInMeters);
}
}
<span class="hljs-keyword">class</span> Horse <span class="hljs-keyword">extends</span> Animal {
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">name: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">super</span>(name); }
move(distanceInMeters = <span class="hljs-number">45</span>) {
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">"Galloping..."</span>);
<span class="hljs-keyword">super</span>.move(distanceInMeters);
}
}
<span class="hljs-keyword">let</span> sam = <span class="hljs-keyword">new</span> Snake(<span class="hljs-string">"Sammy the Python"</span>);
<span class="hljs-keyword">let</span> tom: Animal = <span class="hljs-keyword">new</span> Horse(<span class="hljs-string">"Tommy the Palomino"</span>);
sam.move();
tom.move(<span class="hljs-number">34</span>);</code></pre>
<p>This example covers quite a few of the inheritance features in TypeScript that are common to other languages.
Here we see the <code>extends</code> keywords used to create a subclass.
You can see this where <code>Horse</code> and <code>Snake</code> subclass the base class <code>Animal</code> and gain access to its features.</p>
<p>Derived classes that contain constructor functions must call <code>super()</code> which will execute the constructor function on the base class.</p>
<p>The example also shows how to override methods in the base class with methods that are specialized for the subclass.
Here both <code>Snake</code> and <code>Horse</code> create a <code>move</code> method that overrides the <code>move</code> from <code>Animal</code>, giving it functionality specific to each class.
Note that even though <code>tom</code> is declared as an <code>Animal</code>, since its value is a <code>Horse</code>, when <code>tom.move(34)</code> calls the overriding method in <code>Horse</code>:</p>
<pre><code class="lang-Text">Slithering...
Sammy the Python moved 5m.
Galloping...
Tommy the Palomino moved 34m.</code></pre>
<h1 id="public-private-and-protected-modifiers">Public, private, and protected modifiers</h1>
<h2 id="public-by-default">Public by default</h2>
<p>In our examples, weve been able to freely access the members that we declared throughout our programs.
If youre familiar with classes in other languages, you may have noticed in the above examples
we havent had to use the word <code>public</code> to accomplish this; for instance,
C# requires that each member be explicitly labeled <code>public</code> to be visible.
In TypeScript, each member is <code>public</code> by default.</p>
<p>You may still mark a member <code>public</code> explicitly.
We could have written the <code>Animal</code> class from the previous section in the following way:</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Animal {
<span class="hljs-keyword">public</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">public</span> <span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
<span class="hljs-keyword">public</span> move(distanceInMeters: <span class="hljs-built_in">number</span>) {
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`<span class="hljs-subst">${this.name}</span> moved <span class="hljs-subst">${distanceInMeters}</span>m.`</span>);
}
}</code></pre>
<h2 id="understanding-private-">Understanding <code>private</code></h2>
<p>When a member is marked <code>private</code>, it cannot be accessed from outside of its containing class. For example:</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Animal {
<span class="hljs-keyword">private</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
}
<span class="hljs-keyword">new</span> Animal(<span class="hljs-string">"Cat"</span>).name; <span class="hljs-comment">// Error: 'name' is private;</span></code></pre>
<p>TypeScript is a structural type system.
When we compare two different types, regardless of where they came from, if the types of all members are compatible, then we say the types themselves are compatible.</p>
<p>However, when comparing types that have <code>private</code> and <code>protected</code> members, we treat these types differently.
For two types to be considered compatible, if one of them has a <code>private</code> member,
then the other must have a <code>private</code> member that originated in the same declaration.
The same applies to <code>protected</code> members.</p>
<p>Lets look at an example to better see how this plays out in practice:</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Animal {
<span class="hljs-keyword">private</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
}
<span class="hljs-keyword">class</span> Rhino <span class="hljs-keyword">extends</span> Animal {
<span class="hljs-keyword">constructor</span>(<span class="hljs-params"></span>) { <span class="hljs-keyword">super</span>(<span class="hljs-string">"Rhino"</span>); }
}
<span class="hljs-keyword">class</span> Employee {
<span class="hljs-keyword">private</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
}
<span class="hljs-keyword">let</span> animal = <span class="hljs-keyword">new</span> Animal(<span class="hljs-string">"Goat"</span>);
<span class="hljs-keyword">let</span> rhino = <span class="hljs-keyword">new</span> Rhino();
<span class="hljs-keyword">let</span> employee = <span class="hljs-keyword">new</span> Employee(<span class="hljs-string">"Bob"</span>);
animal = rhino;
animal = employee; <span class="hljs-comment">// Error: 'Animal' and 'Employee' are not compatible</span></code></pre>
<p>In this example, we have an <code>Animal</code> and a <code>Rhino</code>, with <code>Rhino</code> being a subclass of <code>Animal</code>.
We also have a new class <code>Employee</code> that looks identical to <code>Animal</code> in terms of shape.
We create some instances of these classes and then try to assign them to each other to see what will happen.
Because <code>Animal</code> and <code>Rhino</code> share the <code>private</code> side of their shape from the same declaration of
<code>private name: string</code> in <code>Animal</code>, they are compatible. However, this is not the case for <code>Employee</code>.
When we try to assign from an <code>Employee</code> to <code>Animal</code> we get an error that these types are not compatible.
Even though <code>Employee</code> also has a <code>private</code> member called <code>name</code>, its not the one we declared in <code>Animal</code>.</p>
<h2 id="understanding-protected-">Understanding <code>protected</code></h2>
<p>The <code>protected</code> modifier acts much like the <code>private</code> modifier with the exception that members
declared <code>protected</code> can also be accessed by instances of deriving classes. For example,</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Person {
<span class="hljs-keyword">protected</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">name: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = name; }
}
<span class="hljs-keyword">class</span> Employee <span class="hljs-keyword">extends</span> Person {
<span class="hljs-keyword">private</span> department: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">name: <span class="hljs-built_in">string</span>, department: <span class="hljs-built_in">string</span></span>) {
<span class="hljs-keyword">super</span>(name);
<span class="hljs-keyword">this</span>.department = department;
}
<span class="hljs-keyword">public</span> getElevatorPitch() {
<span class="hljs-keyword">return</span> <span class="hljs-string">`Hello, my name is <span class="hljs-subst">${this.name}</span> and I work in <span class="hljs-subst">${this.department}</span>.`</span>;
}
}
<span class="hljs-keyword">let</span> howard = <span class="hljs-keyword">new</span> Employee(<span class="hljs-string">"Howard"</span>, <span class="hljs-string">"Sales"</span>);
<span class="hljs-built_in">console</span>.log(howard.getElevatorPitch());
<span class="hljs-built_in">console</span>.log(howard.name); <span class="hljs-comment">// error</span></code></pre>
<p>Notice that while we cant use <code>name</code> from outside of <code>Person</code>,
we can still use it from within an instance method of <code>Employee</code> because <code>Employee</code> derives from <code>Person</code>.</p>
<p>A constructor may also be marked <code>protected</code>.
This means that the class cannot be instantiated outside of its containing class, but can be extended. For example,</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Person {
<span class="hljs-keyword">protected</span> name: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">protected</span> <span class="hljs-keyword">constructor</span>(<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) { <span class="hljs-keyword">this</span>.name = theName; }
}
<span class="hljs-comment">// Employee can extend Person</span>
<span class="hljs-keyword">class</span> Employee <span class="hljs-keyword">extends</span> Person {
<span class="hljs-keyword">private</span> department: <span class="hljs-built_in">string</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">name: <span class="hljs-built_in">string</span>, department: <span class="hljs-built_in">string</span></span>) {
<span class="hljs-keyword">super</span>(name);
<span class="hljs-keyword">this</span>.department = department;
}
<span class="hljs-keyword">public</span> getElevatorPitch() {
<span class="hljs-keyword">return</span> <span class="hljs-string">`Hello, my name is <span class="hljs-subst">${this.name}</span> and I work in <span class="hljs-subst">${this.department}</span>.`</span>;
}
}
<span class="hljs-keyword">let</span> howard = <span class="hljs-keyword">new</span> Employee(<span class="hljs-string">"Howard"</span>, <span class="hljs-string">"Sales"</span>);
<span class="hljs-keyword">let</span> john = <span class="hljs-keyword">new</span> Person(<span class="hljs-string">"John"</span>); <span class="hljs-comment">// Error: The 'Person' constructor is protected</span></code></pre>
<h1 id="readonly-modifier">Readonly modifier</h1>
<p>You can make properties readonly by using the <code>readonly</code> keyword.
Readonly properties must be initialized at their declaration or in the constructor.</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Octopus {
readonly name: <span class="hljs-built_in">string</span>;
readonly numberOfLegs: <span class="hljs-built_in">number</span> = <span class="hljs-number">8</span>;
<span class="hljs-keyword">constructor</span> (<span class="hljs-params">theName: <span class="hljs-built_in">string</span></span>) {
<span class="hljs-keyword">this</span>.name = theName;
}
}
<span class="hljs-keyword">let</span> dad = <span class="hljs-keyword">new</span> Octopus(<span class="hljs-string">"Man with the 8 strong legs"</span>);
dad.name = <span class="hljs-string">"Man with the 3-piece suit"</span>; <span class="hljs-comment">// error! name is readonly.</span></code></pre>
<h2 id="parameter-properties">Parameter properties</h2>
<p>In our last example, we had to declare a readonly member <code>name</code> and a constructor parameter <code>theName</code> in the <code>Octopus</code> class, and we then immediately set <code>name</code> to <code>theName</code>.
This turns out to be a very common practice.
<em>Parameter properties</em> let you create and initialize a member in one place.
Heres a further revision of the previous <code>Octopus</code> class using a parameter property:</p>
<pre><code class="lang-ts-ignore"><span class="hljs-keyword">class</span> Octopus {
readonly numberOfLegs: <span class="hljs-built_in">number</span> = <span class="hljs-number">8</span>;
<span class="hljs-keyword">constructor</span>(<span class="hljs-params">readonly name: <span class="hljs-built_in">string</span></span>) {
}
}</code></pre>
<p>Notice how we dropped <code>theName</code> altogether and just use the shortened <code>readonly name: string</code> parameter on the constructor to create and initialize the <code>name</code> member.
Weve consolidated the declarations and assignment into one location.</p>
<p>Parameter properties are declared by prefixing a constructor parameter with an accessibility modifier or <code>readonly</code>, or both.
Using <code>private</code> for a parameter property declares and initializes a private member; likewise, the same is done for <code>public</code>, <code>protected</code>, and <code>readonly</code>.</p>
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