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Build the future of the web with modern JavaScript

Mathias Bynens
Software Engineer at Google
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2018 Google I/O
May 8, 2018, Mountain View, USA
2018 Google I/O
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Build the future of the web with modern JavaScript
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About speakers

Mathias Bynens
Software Engineer at Google
Sathya Gunasekaran
Software Engineer at Google

Mathias is a JavaScript Whisperer on the V8 team. He focuses on evolving the ECMAScript language through TC39 and on making V8 run modern JavaScript features more efficiently.

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Sathya Gunasekaran is a software engineer on the V8 team. In this role, he focuses on implementing new JavaScript language features in V8. He serves as a delegate representing Google at TC39, which standardizes new ECMAScript features.

View the profile

About the talk

This presentation gives an overview of cutting-edge JavaScript development techniques to build modern web and Node.js apps. Discover which features to expect in Chrome and Node.js soon, how the V8 engine optimizes for them, and how to improve real-world performance and stability on the Web and in Node.js.

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Hi everyone, and welcome to this session on building the future left with modern JavaScript. This is such a my name is we work on the VA theme on Google and it is the JavaScript engine that's used in Google Chrome and an other and better such as nodejs and electron. For example. Telescope started out as a scripting language of the web and to this day. It's still a crucial piece of that technology. But today extends far beyond the web to the entire surroundings Art phone. So if we take it if we take a step back from just V8 and chrome

Regency. JavaScript allows you to build engaging weather to be rinses that work in a wide variety of browsers. I would notice telescopes can be used to build powerful command line tools servers and other applications react-native enabled building cross-platform mobile apps also using with the electron JavaScript and other website analogies can be used to build cross-platform desktop apps gels can't even run on low-cost iot devices nowadays. Dallas is everywhere. That's a learning JavaScript or improving a JavaScript

skills is an excellent time investment. Google we want to enable this enormous JavaScript ecosystem. And we do so in multiple ways first their ct-39. This is the committee that governs the evolution of a script which is the standard behind the telescope language. We actively participate in the standardization efforts together with other browser vendors and Industry stakeholders, and we bring back feedback from us as implementers and from you the developer community. Watch all of our participation in the standard process. We constantly improve our own JavaScript

engine V8. We boost its runtime performance is memory usage and Implement new language features as they're being sanitized. The VA projects this mission is to leave real real performance for modern JavaScript and to enable developers to build a faster future web. Now. That's quite a mouthful. That's a lot of words, but don't worry cuz in this presentation we're going to zoom in on some aspects of this mission. First let's discuss what we mean when we say real world performance. We stepped away from synthetic benchmarks that we used in the past instead. We now

focus on optimizing real website and JavaScript application. Of course, we need a way to measure our efforts in this area and luckily some mother and benchmarks are good approximation of real world performance. We consider the speedometer to Benchmark to be a good example of that. It is a good proxy for real world performance because its uses common Frameworks libraries and built tooling patterns that are being used on production websites that we see in the wild and over a time span of a just for Chrome releases. We have teeth as 21% overall Improvement on speedometer two and one key highlight

here is that we more than double our run time performance of the react framework. That's a pretty big deal. And this is not just optimization in isolation or data shows that optimizations to apps and speedometer to translates to performance improvements in real-world apps. About speedometer focuses on web app swipe heavily. But if you think about it, a lot of web development uling is built on top of note e s m performance matters there as well. So we decided to optimize for popular real-world tools such as side script Bobble and prettier as well as the

outfits that they generate by using the web Dueling Banjos Mark, and we've had some nice Improvement so far. New features are being attitude of jealous with language constantly. We're working on making them available in V8 and chrome as soon as possible modern telescopes features have good Baseline performance, and we're continuously working on making them even faster. So as a developer, please don't hesitate to use these modern telescopes features. They're often more performance that has written Alternatives. So it means that you can just focus on writing idiomatic code that

makes sense for you and we'll worry about making it fast. On top of run Time Performance with constantly focusing on reducing vs memory footprint and improving down over to Langford debugging memory leaks. This is especially important for devices such as mobile phones or even iot devices recently by changing weird. We made it easier to find attached. Please or leaks an event listeners you think of trump DuckTales? Better memory tooling ties directly into our mission as a substitute for spell better apps.

What we talked about your work performance we talked about dueling. I think it's skip the middle part of our mission. Yes, it's modern JavaScript for the rest of this dog. We're going to be taking a look at some of the cutting-edge JavaScript language features that we've been working on both on the standardization side and on the implementation site in VA. Let's start off with akma script module modules are a major new feature and actually a collection of features in JavaScript. You may have to use a user Lance childhood module system in the past.

Maybe you use Tom and Jeff and nose or maybe a used AMD or maybe something else but one thing all these model systems have in common is that they allow you to imports and exports of values and jealous GIF now has standardized index for exactly that within a module you can use the export keywords to ask for just about anything you can export accounts or a function or any kind of tell you all you have to do is prefix the variable statements or the Declaration with the export keyword and that's it. You're all set. Now you can use the import keywords to import a module from another

module. So here were importing the repeats and shouts functionality from the lit module and we're using it in our main module. Marshalls are a little bit different than regular scripts. For example modules have strict mode enabled by default. Also this new synthetic imports and exports index is only available in Madill. It doesn't work in regular strips and because of these differences the same jealous might behave differently when treated as a module versus a regular script as such the Dallas run time needs to know which scripts are modules. On the web

you can tell the browser that is script is a module by setting the type attributes to module. Browsers that understands type module also in the stands and no module attributes and they ignore scripts with the no module attribute. This means that you can serve a module 3 2 module supporting browsers while still providing a fall back for other browsers and the ability to make this distinction is pretty amazing by itself. It's only for performance. Just think about it only modern browsers support modules. That means if a browser understands your module code, it also supports features that were

around before modules such as Arrow functions, for example, so you don't have to come spoil those features in your module bundle anymore. You can serve smaller and largely unfriends files on those too much using modules to Modern browsers and only Legacy browsers need that no module Palos. Now you can optimize delivery of your modules even further by using link Rel module 3 load. This way Rouses can free those and even three parts and recompile modules and their dependencies. Now you may have noticed that we're using the MTS file extension for modules on the

way. The file extension doesn't really matter as long as a file is served with a jealous with my side, which is fact not lost. The browser already knows that it's a module because of the type attribute that you put on the script element, but still we recommend to use mgs4 modules for consistency with no chairs for MDS is actually required. Note has experimental modules support for files. But only with the MDS extension the note ASTM is still working out some issues around interoperability here. So I expect more updates on this soon. We recommend to use the JS

extension for regular script and empty as extension for modules note ass needs its to make modules work and on the way up the file extension doesn't matter anyway, so you might as well be consistent with known and used MTX that way you can potentially run the exact same modules the exact same files both on the web and in no tears. So far with only use static Imports with static import your entire module grass needs to be downloaded and executed before your main code can run. Sometimes you don't want to load a module up front. But Runner on demand only

when you really need it when the user clicks the link or a button, for example, this improves the initial load Time Performance. But we recently added support for dynamic Imports, which also works in regular scripts unlikes Paddock Imports. So let's say you have some navigation links in an HTML element in an HTML document better sort apps on them instead of navigating to another page. You want to download a module and run some code for it, which is been since the module and an update the face. We can do that as follows. We had flicked event listeners through the lens of cancel the

navigation and then Dynamic Elite Imports the corresponding module that specify its through the data entry module at once. The module is loaded we can use whatever task force in this case. We use the load page in flu export which is a function that is called and then it intentions the module and it updates the page. Another new module related feature is important matter which gives you metadata about the current module the exact it's not specified as part of the standard. It depends on the horse temperament. This means that in a browser, you might get different method. I

didn't know what to ask. For example, here's an example of imports. Mehta on the web by default images are loaded relative to the current URL in HTML document what's important that you around makes it possible to load an image relative to the current module instead gives you much more freedom. With modules, it becomes possible to develop websites without using Butler such as roll up or what I think however loading performance of bundled applications is better than unbundled ones and one reason for this is that the Import and Export syntax is statically analyzable which means it's

going to help these bungler tools to optimize your coat by eliminating unused exports static imports and exports are more than just syntax. They are a critical tooling feature. Of course, we're working to improve the performance of native models out of the box, but please continue to use Butler's before deploying to production. It's very similar to minifying your code before that's always going to result in a performance benefit because you end up shipping less code and bundling has the same effect. So keep bundling. All modern browsers already support modules as of this morning when Firefox

60 was released as we discussed. No, Jazz has an experimental implementation behind the flag. Well, that was a lot of cool features and male models. Now. Let's take a look at some of the smaller more incremental features coming to Dallas. What's a hotels with a little quiz quick? What's his number? Is this a billion 10 billion? What about this number? What's the order of magnitude for this number? I'm sure you can all answer this given enough time. But launch newmaker Shoals are difficult for the human eye to farts quickly, especially when there are lots of

repeating digits like in the first example. That's why I knew Dallas could feature enables underscores has separators in numerical trolls. So instead of writing this like this. You cannot write them like this grouping the deserts 4000 now it's easier to tell that the first number is in fact a trillion and the second numbers in the order of a billion dismal feature helps improve readability and it's not just regular dose of base 10. A binary, New Mexico Falls. You may want to grab the bed by octet or by nibbles depending on the USPS?

4 hexadecimal in regular rolls. He may want to grab the results for bike. This picture is so got to get that it's not serving anywhere yet. It's building Senator and that's open spec issues that need to be resolved. Do you have an implementation Vienna flag and Truman VA? And as soon as the spec is ready, we will update our implementation and ship it another new feature involving numbers is Biggins which brings arbitrary Precision integer supports to JavaScript. Let's take a look at what that means exactly numbers in JavaScript are represented as double

Precision floats. This means that they have limited Precision the max safe integer constant gives the greatest possible integer value that can safely be incremented. You can see that here. If we increments. It's ones. We still got the correct results. But if we done incremented the second time we get the same number as before that's not the right results mathematically speaking and this happens because the result is no longer exactly representable as a JavaScript number. Begin, Zara new numeric primitive in JavaScript that can represent integers with arbitrary Precision

with big UNS. You can safely store and operate on large integers even Beyond the Sea integer limit for regular numbers to create a Biggins just at the end suffix to any integer literal the global big and function can be used to convert a number into a big sign on McQueen and here we're combining those two techniques to calculate the sum and this time we do get the correct result. Here's another example for multiplying two regular numbers. And if we take a look at the least significant digits here nine and three we know what the results of the multiplication sentence

seven because sometimes 327 however the result and did a bunch of zeros that can't be right. So let's try this again with big ants instead. And indeed this time we do get the correct result Biggins make it possible to accurately perform integer arithmetic and most importantly it's not possible to safely represent a Google and JavaScript. Is it gonna help me in my day-to-day programming for sure? On a more serious note. Why would you need begin to take a large number? That's one use case, but what else is there? Well, it turns out that without

begins. It's very easy to run into books that are very hard to do book 3 ideas, for example, or 64-bit integers meaning they cannot safely be represented as a jealous with number. So if you tried you would run into very sneaky box where some ideas with suddenly turn into other numbers and until now developers have to represent such ideas as strength instead, but with bigen you can represent them using a numerical type when it makes sense to do so. Here's another example of a real world book that occurs in military US sometimes different files or folders

appear to have the same I knows which is supposed to be a unique number for file the fundamental cause of this book is the imprecision of JavaScript numbers begins don't have this problem. Another use case. It's representing high-precision timestamps accurately using regular numbers. This is not possible without losing accuracy, which would Biggins the Precision is guaranteed. That's why I noticed it's currently looking into exposing Biggins instead of numbers for some of its built-in apis where it makes sense. Historically developers have been working around

electric Precision by using bignum libraries implemented in child script and when we benchmarked or native big and implementation responded it consistently outperform the user length Alternatives. So once Biggins become widely available applications will be able to drop these runtime dependencies in favor of native Biggins. This will help reduce low time part-time compile time and on top of all that it will offer significant runtime performance improvements. I can't wait for that to happen. But right now it's still early days for bigen Chrome 67 ships with big and

supports this means that chromium-based browsers such as Opera support it as well, but other browsers are still actively working on their implementations, you can expect wider big and support soon. You maybe someday that was for off Luke's and the iteration for us all and more recently JavaScript support for racing functions. The new set of features combined fees together to form a single tomatoes and generators. Let's say you want to find out the response size of a request isn't functions. Make it easy to

work with the fetch API and the response creamer. But there's still a bit of boilerplate required to iterate each junk away to each junk and then manually check if you're done with the Stream. What is an iterative the code is much cleaner and more ergonomic. There's no manual awaiting of each chunk or checking to see if the stream is done the 408 of loop just as all that dreams aren't using interval quite yet, but there's ongoing sanitization work being done to make it work. Similarly,

you can expect more and more apis duet easing erasing support in the future. And this is already happening in Millard. So no Jazz has built-in swimming apis such as readable stream that can be used with the old school call back style in this example with collecting all day until the stream and at which point represents the result to do so we need two different call backs. With no Jazz, Washington now you can use a cigarette has out of the box. So instead of using call back. We cannot write a

single for a weight of a particular right over all the songs. Brother support for raising arrows Android of including the 408 of syntax is pretty good already from Firefox Opera and Safari Tech preview or they have support a stylus notes Babel is your friend. It's supposed transpiling 2408 of syntax. Regular Expressions also recently got some much-needed love with multiple new features that help improve their readability and their maintainability and one such feature is called. Almost. Let's say you have some input tax and you want to apply a regular expression to it.

In this case. You can see it at the text contains the phrase hello world right there. So let's write a regular expression that checks whether the input contains. Hello followed by any character followed by world. Can regular Expressions the dogs can be used to match arbitrary characters. So this regular expression should match right? Well, it turns out that it doesn't match. The problem is that the dots in fact does not match all characters. It only mentions characters that child script does not consider to be line Terminators and there happens to be a line Terminator in the

input string right there. That's a new line. Sometimes you're really do want to match any character including newline. This problem is so common that developers have started to use workarounds like this. So here we're matching any whitespace character or any know my face character which effectively matches any character. Another workaround is to use any gated empty character class this matches any character that is not nothing which effectively much as any character. So these two techniques were but they're not very intuitive or readable and stuff. Like this is why regular

Expressions got a bad reputation for being hard to decipher, but it doesn't have to be this way. A new regular expression flag makes them. Truly match any character including line Terminators, you can use this as flag to enable the. All mode. This is one of those flags that you'll probably want to enable for every single regular expression you ride from now on just like the you flag for Unicode mode these two flags make the behavior of JavaScript regular Expressions less confusing and more sensible. And here's an easy trick to remember these flags instead of s u you can

just write you went this makes our code more America friendly and your regular expression Behavior less surprising. Not all mode is currently supported in Chrome Opera Safari and noticed but Bob has filed his features so you can use this while still supporting other browsers as well. Another new feature improves capture groups and regular Expressions. Let's take a look at an example. This regular expression matches 4 digits followed by a hyphen followed by two digits for by hisun followed by another two digit. Each

set of digits is wrapped in a parenthesis to create a capture group each capture group in a regular expression automatically gets an index and can be referenced using that in the next 3 capsule ribs in this example. So the first one Maps index won in the match object. The second capture group maps to index and the maps to index 3 you get the idea. Capture groups are useful, but referencing them by index is not very readable or maintainable imagine adding a new capture group to the start of the pattern that all the existing

index of shift and all the cold relying on the ordering has to be updated. A new feature of makes it possible to assign a name to each capture group. So this makes the regular expression itself more readable because it certifies what each group stands for. Instead of using indexing we can refer to each capsule Group by name. So this improve the reliability and maintainability of any code that uses regular expression as well. So now we can refer to the first capture group without an entire year. second Captain Hook without any fire

month and the thought cats are great without any fire today. Name capture groups are currently supported in Chrome Opera Safari and note ideas for using transpire and polyfill this feature. Another regular expression feature involves Unicode properties the Unicode standard a science various properties and property values to every symbol you can think of unicorns property of gas to make it possible to access these Unicode character properties natively in regular expression. For example, the pattern script

extensions Greek matches every symbol that is used in the grease script previously. We have to resort to a large runtime dependencies or build scripts to just mimic this functionality, but don't Solutions light through performance and maintainability issues with with built-in support for Unicode property escapes creating regular Expressions based on unicorn properties couldn't be easier. And this is not just useful for complex Unicode specific properties. It also helps with some more common tasks such as matching ASCII characters. For example, you could just fill out to ask you

range from 0 to 7 f yourself, but why would you bother when you can just refer to it by name like this? It's easier and your regular expression instantly becomes more readable and more maintainable. Another example of chemical property escapes is matching all math symbols, according to the Unico standard. This would match the not equals to sign. For example. And here's an example that combines multiple property escapes this pattern matches any letter, including no Nazca letters and white space characters according to the Unicode standard and indeed if we apply it on a

piece of text that is written in Greek it matches. This regular expression feature is not just useful in JavaScript. It can be used in HTML as well input and text area elements has a better and attribute that is used for client. I tell you they Unicode property escapes work there as well. So when this is CML document loads the input field gets a light green background because the banner matches the input value as soon as you enter any character that is not a letter or a space the input states which is to invalid and the background becomes pink. Unico properties

Cape sore already implemented in Chrome Opera Safari and no tears by all the future so you can use it while still supporting all browsers. Another new feature in love looking around in a regular expression without consuming anything. JavaScript support local hats and regular expression. This is not new. Positive look ahead and shows a pattern is followed by another pattern example for matching asking numbers. But only if they are followed by a space followed by the word dollar store for the input string

$42 to match contains the numeric Part 42 until all the negative look-ahead and shows up. I don't is not followed by another pattern in this example, but only if they're followed by something other than a space followed by the word Dollar's strength 42 rupees the match only convincing you make pod 42 Look at are not new in Dallas. What's new is a very similar feature. Regular expression patterns now support look behind as well. Positive look behind and

shows that I don't is preceded by another in this example for matching Caskey numbers. But only if they are preceded by a dollar sign so for the input string dollar 42 the match condensing to make 542 I'm Somali negative look behind an iPad on is not followed by another pattern for not preceded by another in this example for matching asking numbers. But only it were preceded by something other than a dollar sign. So for the input string rupee 42 to match condenser to make 542 Look behind. Just as useful as look ahead

until recently there was no Bolton way of using look behind in Dallas. I've seen that in the absence of look behind support is to reverse a string and then I fly I look at instead. This indeed me makes it look behind kind of but it's all the complicated and confusing and thanks the native support for look behind you. No longer need ugly hats like that. And look Beyond already supported and chrome Opera and no jazz. one feature that's related to regular Expressions is string match

all it's comin to repeatedly apply the same regular expression on a string to get all the matches and this is already possible by writing your own Loop and keeping track of the match objects yourself, but it's a little bit annoying to do so. The string of prototype. Match of simplifies this common scenario that allows you to more easily iterate over all the matches. The idea is that you're just write a simple for off Loop and string match. I'll take care of the rest for you. Spring machol is still being standardized but we have an implementation behind the flag and

V8 and chrome but we won't ship it until some open spectator shoes are resolved. So expect this to come through a browser near you very soon. Another new proposal a White's the creation of an unused binding for try catch blocks. It's common to use try catch block the cat exceptions and then handle them accordingly. But sometimes you don't really care about the exception object that is available in the catch block still previously you had to bind the exception to a variable otherwise to get a syntax error. What is Vienna gazelle optional

in cases where you don't need to accept an object? You cannot Wilmette the parenthesis and identifier flying catch. The Cardinal looks a little simpler. This small feature makes patterns that don't use a cat's variable play nicely with lenders that complain when there's an unused variable. The cast of my name is already optional in Chrome Firefox Opera Safari and nerd for why does support is bubble trance while this feature? Another new feature has to do with framing. You may already know about

the threat message on strain switched rims white space on both sides of the string. Now, there's also the trim start and trim and methods these methods allow you to pay NY place for only the start or the end of the Swing very small, but very useful piece of new functionality. One sided string trimming already Works in Chrome Firefox Opera Safari and note the provider support functionality can probably be fulfilled including my Bobble. Another new jobs feature is the finally method on the promise. I've what's if you want to implement a

Fetch and display function that takes a URL load some data from it and then displays the result in a Dom element. Let's walk through the implementation together. We display a loading spinner in case to request. We're about to kick-off. Take to Weiler. Can we start a request? If the request fails we end up in the promises catch Handler, we just laying her a message and hide the spinner. If not, we continue we get to hdb response body in text form. We don't show the text and the Dom element that was passed into the function

and then hide the spinner. So if the request exceeds we display the data if something goes wrong, we display an error message instead. We had to call hide loading spinner and we had no choice but to duplicate this call in both the den and the catch handlers. But in modern JavaScript we can do better. Thanks for promise for like finally. Not only does His Radio Scott duplication. It also separates the success or handling from the scene appears more clearly pretty neat.

In this particular example, when you have full control over the code, you can also use async await which is my personal preference. You can write that up in a try catch finally block. Promise for Life finally still useful if you don't control the code signing a promise or if you only have the promise object. Promise finally is strongly supported in Chrome Firefox Opera Safari and nerd and this functionality can be poly filled. The next feature I want to talk about it's called I'll check the rest and spread and I hear you all thinking rest and spread that's not new in

JavaScript arrays have had this for years and you're absolutely right. Here's how rest elements work with array elements were using a rate of structuring here and we have an array of prime numbers. We want to extract the first and second elements into their own variable. We danced or all the remaining array elements into an array that we call rest. And here's a race bread in action. I noticed his ex looks exactly the same but they're two different features. Technically. If it's on the left hand side of an equal sign, then it's rest elements. If not, it's spread any way here would

take the far from the first example and we put them back together into a copy of the original array these two features allow you to rest or spray array elements. But y'all skip now offers arrest and spread functionality for object properties as well. This example shows how properties come in handy when using object destructuring. We have an object and we expect the first name and last name properties into their own variables. We danced or the remaining properties in an object that we call rest. running object is now possible in object literals to so in this

example, we use the Deep structures far as from before and we put them back together into an equivalent object that is effectively a copy of the original person object that we started out with running properties offer a more elegant alternative to object assign in many situations. Shell Oconee an object is one example, this is already possible using I'll take the sign but it's a little awkward because she has to pass in an empty new object. Which bread properties you can just perform to spread as far as the object literal itself. It's much more elegant and it even offers greater

optimization potential in JavaScript engines compared to object to sign. Merging objects is another example. Once again, I'll take the sign can already do this. But if you forget to fasten a new empty object as the first argument, then you end up mutating. The default settings are check which is probably not what you want. It's just a little while chords. Spread properties help here to buy using them. There is no way to accidentally muted object on top of that the code is very nice and elegant and easy to read. I'll take the rest and spread properties are currently supported in

Chrome Firefox Opera Safari and Note and baubles divorce filing this feature. Recently JavaScript interview classes that pulls up on the prototypal object model of JavaScript a bunch of new proposals involve the decorative API of classes. Here's a simple sauce for an increase encounter does a Constructor that creates an instance property count and set the default value 203 use underscore did you know that count is a private property? But that's just a convention. The language doesn't enforce it.

We also installed an increment method on the floor live. The new classy of proposal introduces public instant skills and sauces. So this moves the instance fields from The Constructor to the top Body Concepts of construct a function is no longer required. This new coffee is proposal also introduces Private Sales private field and force the encapsulation at the language level private field cannot be accessed outside the class party. So instead of using underscore to get out of private property we used to have sign.

This is another bleeding edge feature that is still being sanitized. We have an implementation Guyana flag in Viet and we're looking forward to serving the soon once the spec issues are resolved. So if looked at a lot of cutting at the telescopes pictures today, but what's the main takeaway for Developers? Johnlscott language is continuously evolving and we're working on making new language features available in V8 and chrome as soon as we can developers, like yourself shouldn't be afraid to use these modern JavaScript features. They have decent Baseline performance and Amanda Coleman

cases there even faster than hands written or friends filed equivalents. We understand that you do need to support a wide range of browsers and environment entrance filing your coat helps with that. But we ask you to consider transpiling a selectively to keep bundle size small and to avoid transpiling away potential optimizations that his mother language features Holt Bobble 3 CFM allows you to only those features that you really need to transfer file based on the browser and environments that you support similarly be recommence continuing to use existing Butler such as well pack or

roll-up. They work very well together with modern language features, especially with modules and they help you provide a performance experience through your users. We're interested in your feedback on this presentation. So please go to this website and let us know what you think. And don't forget to follow us on Twitter and follow up VHS as well. We'll be tweeting link with more information about the features. We just discussed and after the stock will be hanging out at the web. Sandbox still just come over and talk to us if you have any feedback or questions at all. Thanks for

listening and enjoy the rest of oil.

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