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<!DOCTYPE html>
<html slick-uniqueid="3">
<head>
<style>
@font-face {
font-family: 'Roboto';
font-style: italic;
font-weight: 300;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOjCnqEu92Fr1Mu51TjASc6CsE.ttf) format('truetype');
}
@font-face {
font-family: 'Roboto';
font-style: italic;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOkCnqEu92Fr1Mu51xIIzc.ttf) format('truetype');
}
@font-face {
font-family: 'Roboto';
font-style: italic;
font-weight: 700;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOjCnqEu92Fr1Mu51TzBic6CsE.ttf) format('truetype');
}
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 300;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmSU5fBBc9.ttf) format('truetype');
}
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font-family: 'Roboto';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxP.ttf) format('truetype');
}
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 700;
src: url(https://fonts.gstatic.com/s/roboto/v30/KFOlCnqEu92Fr1MmWUlfBBc9.ttf) format('truetype');
}
@font-face {
font-family: 'Source Code Pro';
font-style: normal;
font-weight: 200;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DEyQtMlrSQ.ttf) format('truetype');
}
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font-family: 'Source Code Pro';
font-style: normal;
font-weight: 300;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DJKQtMlrSQ.ttf) format('truetype');
}
@font-face {
font-family: 'Source Code Pro';
font-style: normal;
font-weight: 400;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DMyQtMlrSQ.ttf) format('truetype');
}
@font-face {
font-family: 'Source Code Pro';
font-style: normal;
font-weight: 500;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DP6QtMlrSQ.ttf) format('truetype');
}
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font-family: 'Source Code Pro';
font-style: normal;
font-weight: 600;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DBKXtMlrSQ.ttf) format('truetype');
}
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font-family: 'Source Code Pro';
font-style: normal;
font-weight: 700;
src: url(https://fonts.gstatic.com/s/sourcecodepro/v23/HI_diYsKILxRpg3hIP6sJ7fM7PqPMcMnZFqUwX28DCuXtMlrSQ.ttf) format('truetype');
}
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<title>
MooTools Blog: Get friendly with the Natives
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<h2>
Get friendly with the Natives
</h2>
<small>
Written by Ryan Florence on 24 March 2010 &ndash; Posted under
<a>
all
</a>
,
<a>
tips
</a>
</small>
<div class="post">
<p>
Have you extended a Native lately? It's an incredibly helpful thing.
</p>
<div class="heading clearfix">
<h3>
The Difference:
</h3>
</div>
<p>
I've seen stuff like this:
</p>
<pre><code class="javascript">fn1(fn2(<span class="number">10</span>, fn3(<span class="string">'house'</span>)));</code></pre>
<p>
Hard to figure out what's happening. Instead you can write code like:
</p>
<pre><code class="javascript">fn3(<span class="string">'house'</span>).fn2(<span class="number">10</span>).fn1();</code></pre>
<div class="heading clearfix">
<h3>
A Useful, Real Example, zeroPad
</h3>
</div>
<p>
I've used this in a couple scripts, it takes a number and returns a string with zeros padded in front: 123 becomes '000123'. Really handy for filenames and the like.
</p>
<div class="heading clearfix">
<h3>
Functionally Based Example
</h3>
</div>
<pre><code class="javascript"><span class="function"><span class="keyword">function</span> <span class="title">zeroPad</span><span class="params">(num, zeros)</span>{</span>
zeros = zeros || <span class="number">3</span>;
<span class="keyword">var</span> str = <span class="string">''</span> + num;
zeros.times(<span class="keyword">function</span>(){ str = <span class="string">'0'</span>+str; });
<span class="keyword">return</span> str;
};
<span class="comment">// usage</span>
doSomething(zeroPad(document.getElementById(<span class="string">'myInput'</span>).value, <span class="number">3</span>));</code></pre>
<div class="heading clearfix">
<h3>
Native Extentions Based Example
</h3>
</div>
<pre><code class="javascript">Number.implement({
zeroPad: <span class="keyword">function</span>(zeros){
<span class="keyword">var</span> str = <span class="string">''</span> + <span class="keyword">this</span>;
zeros.times(<span class="keyword">function</span>(){ str = <span class="string">'0'</span>+str; });
<span class="keyword">return</span> str;
}
});
<span class="comment">// so that it works on both numbers and strings</span>
String.implement({
zeroPad: <span class="keyword">function</span>(zeros){
<span class="keyword">return</span> <span class="keyword">this</span>.toInt().zeroPad(zeros);
}
});
<span class="comment">// usage</span>
$(<span class="string">'myInput'</span>).get(<span class="string">'value'</span>).zeroPad(<span class="number">3</span>).doSomething();</code></pre>
<div class="heading clearfix">
<h3>
Side by Side:
</h3>
</div>
<pre><code class="javascript">doSomething(zeroPad(document.getElementById(<span class="string">'myInput'</span>).value, <span class="number">3</span>));
<span class="comment">// vs</span>
$(<span class="string">'myInput'</span>).get(<span class="string">'value'</span>).zeroPad(<span class="number">3</span>).doSomething();</code></pre>
<p>
Awesome? Yes.
</p>
<ul>
<li>
<a alt="Array">
Array
</a>
</li>
<li>
<a alt="Function">
Function
</a>
</li>
<li>
<a alt="Number">
Number
</a>
</li>
<li>
<a alt="String">
String
</a>
</li>
</ul>
<p>
Some say extending natives is a bad idea. Personally, I think it's awesome--but this topic is a sore spot for some.
</p>
<div class="heading clearfix">
<h3>
Flippin' Sweet Array methods
</h3>
</div>
<p>
Arian Stolwijk created this amazing gem:
<a alt="Array.Math">
Array.Math
</a>
. Code samples often tell the story faster:
</p>
<pre><code class="javascript">[<span class="number">2</span>,<span class="number">5</span>,<span class="number">1</span>,<span class="number">6</span>].sum(); <span class="comment">// 14</span>
[<span class="number">2</span>,<span class="number">5</span>,<span class="number">6</span>,<span class="number">2</span>].product(<span class="number">3</span>); <span class="comment">// [6,15,18,6]</span>
[<span class="number">9</span>,<span class="number">12</span>,<span class="number">15</span>].quotient(<span class="number">3</span>) <span class="comment">// [3,4,5]</span></code></pre>
<p>
This is all made possible by extending the
<code>
Array
</code>
native, see?
</p>
<pre><code class="javascript">Array.implement({
sum: <span class="keyword">function</span>(start,length){
<span class="keyword">var</span> sum = <span class="number">0</span>,
start = start ? start : <span class="number">0</span>,
length = length ? length : <span class="keyword">this</span>.count()-start;
length = start ? length + <span class="number">2</span> : length;
<span class="keyword">for</span>(<span class="keyword">var</span> i=start;i&amp;lt;length;i++) sum += <span class="keyword">this</span>[i];
<span class="keyword">return</span> sum;
},
product: <span class="keyword">function</span>(p){
<span class="keyword">var</span> arr = $type(p) == <span class="string">'array'</span>;
<span class="keyword">return</span> <span class="keyword">this</span>.map(<span class="keyword">function</span>(entity,i){
<span class="keyword">return</span> arr ? (entity * p[i]) : (entity * p);
});
},
quotient: <span class="keyword">function</span>(q){
<span class="keyword">var</span> arr = $type(q) == <span class="string">'array'</span>;
<span class="keyword">return</span> <span class="keyword">this</span>.map(<span class="keyword">function</span>(entity,i){
<span class="keyword">return</span> arr ? (entity / q[i]) : (entity / q);
});
},
<span class="comment">// and a whole lot more awesome ...</span>
});</code></pre>
<div class="heading clearfix">
<h3>
Quick Tips
</h3>
</div>
<ul>
<li>
<code>
this
</code>
is the number or string, or whatever, when inside the method.
</li>
<li>
Return something that makes sense (usually
<code>
this
</code>
).
</li>
<li>
You can implement several methods all in the same code block.
</li>
</ul>
<p>
This is just one more great tool to help keep your code organized and readable.
</p>
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