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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Memory Leaks in JS</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
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<body>
<div class="reveal" style="font-size: 50px;">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section style="font-size: 44px;">
<h1>Memory Leaks in JavaScript</h1><br/>
<p>Siddhartha Bhagwan</p>
<p>@siddhartha_b</p>
<p><small>Freelance Web Developer</small></p>
</section>
<section>
<p>
Huh? Memory What?
</p>
</section>
<section>
<p>My code doesn't leak. Go away</p>
</section>
<section>
<p>Back in the day</p>
</section>
<section>
<p>Enter AJAX, SPAs, Mobiles</p>
</section>
<section>
<p>Priorities. Get yours right</p>
</section>
<section>
<p>Leaks are creepy</p>
</section>
<section>
<p>Do not kill Experience</p>
</section>
<section>
<p>Who let the leaks out</p>
</section>
<section>
<p>2001 called<br/>
They want their browswer issues back</p>
</section>
<section>
<h3>Garbage collection 101</h3>
<p>Concept of 'reachability'</p>
</section>
<section>
<p>Mark & Sweep</p>
<img src="images/gc.png" width="90%">
</section>
<section>
<p>To each his own</p>
</section>
<section>
<h3>Good</h3>
<img src="images/good.png">
</section>
<section>
<h3>Maybe not so much....</h3>
<img src="images/bad.png">
</section>
<section>
<h3>Hmmm......</h3>
<img src="images/check.png">
</section>
<section>
<h3>Closures</h3>
<pre><code data-trim contenteditable>
function outerFunction(){
var hugeString = 'Really BIG string here';
return function innerFunction(){
// this has access to hugeString even
// after its context ceases to exist
}
}
</code></pre>
</section>
<section>
<p>Leaky Closure I</p>
<pre><code data-trim contenteditable>
var run = function () {
var str = new Array(1000000).join('*');
var doSomethingWithStr = function(){
if(str ===1){
// do something
}
};
doSomethingWithStr();
};
setInterval(run, 500);
</code></pre>
</section>
<section>
<p>Leaky Closure II</p>
<pre><code data-trim contenteditable>
var run = function () {
var str = new Array(1000000).join('*');
var logIt = function() {
// do something
};
setInterval(logIt, 100);
};
setInterval(run, 500);
</code></pre>
</section>
<section style="font-size:38px">
<p>Leaky Closure III</p>
<pre><code data-trim contenteditable>
var run = function () {
var str = new Array(1000000).join('*');
var doSomethingWithStr = function(){
If (str === '1'){
console.log("do something with str");
}
}
doSomethingWithStr();
var logIt = function() {
console.log('interval');
};
setInterval(logIt, 100);
};
setInterval(run, 500);
</code></pre>
</section>
<section>
<p>test/data/jquery-1.9.1.js</p>
<img src="images/IELeaks.png">
</section>
<section>
<img src="images/whateverjs.png" width="100%">
</section>
<section>
<p>WhateverJs</p>
</section>
<section>
<p>Can my code be 100% leak free?</p>
</section>
<section>
<p>Quality of Code</p>
<p>Thought process behind execution</p>
</section>
<section>
<p><strong>Not</strong> to be confused with <em>Memory Optimization!</em></p>
</section>
<section>
<p>Know your tools</p>
<ul>
<li>Browser's Profiler</li>
<li>V8 Profiler</li>
<li>Node Inspector</li>
<li>Node m-trace</li>
</ul>
</section>
<section id="fragments">
<ul>Learn to let go – hoisting, scope</ul>
<p class="fragment">Unbind listeners</p>
<p class="fragment">Closures – use cases</p>
</section>
<section>
<p>Measure. Understand. Fix. Repeat.</p>
</section>
<section>
<p>Case Studies</p>
<ul>
<li><a href="http://www.html5rocks.com/en/tutorials/memory/effectivemanagement/">Gmail's memory leak</a></li>
<li><a href="https://www.joyent.com/blog/walmart-node-js-memory-leak">Walmart Node.js leak</a></li>
<li><a href="http://info.meteor.com/blog/an-interesting-kind-of-javascript-memory-leak">Meteor.js memory leak</a></li>
<li>IE - Circular Reference leaks - blog.coderbear.com</li>
<li>Library</li>
</ul>
</section>
<section>
<p>Thank you!</p>
</section>
</div>
</div>
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