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I like boring stuff but I'm getting


calls I'm 23 at the moment so I think


it's time to do something crazy and you


know there is this buzzword called sad


worthless I wanted to know about


something about it


of course I wanted to connect it with


Robbie and I would like to talk about it


and what is self-fertilize I would ask


you to act on our service providers


evolved from like if thou shalt


infrastructure does a service which was


something like easy - easy - we just


care about operating system we care


about sky scaling here then we got


containers as a service like ECS so we


buy we are scaling our containers then


we have platform as a service like


Heroku which is skate on the application


level and now we have something called


cyber glass which is function as a


service and it's skate on function level


so we have like one application and we


have many functions which we scale or we


don't scale scale them because because


it's survivalist we don't care about


servers so it decisions operational cost


because you don't have to set up servers


you don't need the DevOps you just put


code on the platform and it's running


you don't care about anything it offers


great capability because you don't have


to care about servers


it's everything up to your provider so


you can scale to the limits of the


Amazon so it will be pretty much a lot


and I think it encourages a good code


because you know it if your code is


better it's faster you will pay less and


it's pretty hard to do like big coupled


code so it looks better so demo of of


course is we live demo because I don't


want to be boring anymore what can go


wrong


yeah of course right like I can't handle


it


so so here we have after deployment we


created two functions its application to


take care about bills that I bought


yesterday or just during the event


so it offers two functionalities okay


first one is creating new bill like this


we have oh it worked


so I added it it responded me with new


created object and the list list works -


and time to see some code you know it's


just one function so we can treat it as


one file of Ruby you know it's like very


few lines it's created everything works


at least is pretty simple - but this


everything is big life because several


lists like providers don't support Ruby


still so these are the supported


languages Ruby is not supported and


that's the problem


but you know we are community so we can


work on it so that is a petition you


want function as a service for Ruby


there are already like seven funded


developer signed and you would like to


join if you are interested just go to


services for Ruby dot org and signed


petition with your github account thank


you


[Applause]


okay Ruby on $4 computer okay my name is


Sergey Ivanov normally I develop


backends with Ruby and other languages


but it's during the days in when dark is


cabine


I grab microcontrollers and start to


write ugly C code and today I want to


say couple words about how to run Ruby


on cup of coffee a cup of coffee


is this really small microcontroller in


inside this model it's SP 32 byte by


Chinese expressive on this model there


is also from megabytes of storage and


this microcontroller may have on board


to course of extends to extensive course


it's like arm button not armed just have


megabyte of RAM it's brittle over Ruby


and Wi-Fi and Bluetooth that's enough


for us also all normal wires for


microcontrollers SPI to C and so on so


this model itself cost only $4 dollars


but if you want to tinker with it it's


better to find some development


development board there are a lot of


them we is Lea these battery charges


with screens up to $10 you can just go


to ebay and search for ESP 32 you'll


find a lot of them so to start letting


go is it first you have to install ESP


IDF it's official toolkit based on


freertos real-time operating system


this side expressive this Chinese


company but they have really great the


commutation maybe this is the only


Chinese company with perfect dogs it's


hard to believe so what I found a few


days ago it's a project M Ruby for SP 32


M Ruby is another Ruby interpreter


written by Matz but it's small an


embeddable and it's possible to embed in


such a small device like this


microcontroller so for example if in to


this microcontroller there is also


connected B me to a tee environment


sensor it measured temperature humidity


and pressure so basic sketch how to work


with it we just include library in its


sensor and then written read


measurements so we do it in loop and


after each measurements sleep for 10


seconds so but this microcontroller also


have Wi-Fi on board so we can connect to


Wi-Fi and if it will measure free RAM


after connecting to Wi-Fi it will be


still 150 kilobytes not bad now we want


to send some data from from this device


to cloud to make some measurements I use


the things peak things peak is a public


service where you can store some data


and because we don't have normal HTTP


library we have only some TCP library


for written in Ruby for this


microcontroller that may work so you can


you have to write request by yourself


but it's possible to send data with one


head requests and go on so I think it's


if you want to find full full code it


available on


sling I think small dammit i'm i will


restart my controller now it connects to


Wi-Fi and send data okay if we'll take a


look on how it looks okay it's pretty


clear that it's pretty hot here too


right now 26 degrees I believe our


hearts are really hot and we are really


a dream we have really dry minds and


make smart decisions so is it good to be


clear no when I last finished with this


simple example don't ask me about TLS it


possible on this microcontroller it has


[Music]


[Applause]


thank you from Vlad superb e2 DDD


[Music]


to free okay thanks hello fruits of our


be my name is Adam and I wanted to share


with you quick case study about how rots


love RB impacts developers and also


companies in general I didn't meant to


give a lightning talk today but


yesterday I spoke to Andre and he said


that maybe it's worth to share this this


story with you today and we all know


that everything Andrea says is valuable


maybe not everything but at least we can


take it into consideration so what is


the case the case is that it is my fault


Russell of Araby conference and two


years ago well I I wasn't such a


experienced developer like now so I was


really amazed about everything that I


heard the all these concepts patterns


like DDD CQRS saga patterns etc and I


was I was so surprised amazed and


actually impressed that after the


conference I decided to to dig deeper


this topic and I wanted to use it


actually in work and recently after the


conference in the new project after


reading some blocks of her course blog


posts articles books watching some


presentations I decided to do DDD staff


and a new project and from perspective


of time I need to say that it was kind


of risky decision because no one at the


company had before experience with DDD


so it was risky but actually thanks to


two


for for instance blog posts from our


concei and the rails even store Jam we


were able to succeed and actually it


worked it worked pretty well and we


gained a lot of things out of the box


like for example activity audit trail


log from from even store so that the


thing is that we need to be we need to


have courage I think and Russell Kirby


thanks for this inspiration and I'm


looking for next inspiration after this


particular conference thanks thank you


[Applause]


refine your not to refine


[Music]


so am i letting talk us about it to


refinements and it was you know you know


I was triggered by make hotel not want


to use in refinement and actually it's


not the first time because discussing to


think well there's interesting


discussion in Twitter now I want to use


your finance but we already know that


some of you use it and me personally use


it pretty often


almost every gem I'm working on he used


a couple of refinements and here I'd


like to tell you a little bit about the


story of five months some interesting


facts probably no one no knows and some


use cases and some problems with them so


in order to help you to define whether


you want to use your fine mint or not


so the history and the problem actually


the first problem refinements were


introduced in ribbit - oh and they were


checked as an experimental feature and


that was make them less acceptable


because who want to use experimental


feature in their software no one because


know what happened when it disappeared


for example in the future but since 2.1


it wasn't experimental anymore so it


become a part of the language a pill


still don't use it don't afraid is still


afraid of it because actually from 2.0


to 2.1 there were a lot of problems with


them that's why it was cold marked as


experimental bugs and they are still


some of them actually for some very very


sophisticated use cases and two years


ago I had a chance to interview Kira


Matsuda core team member there were some


interesting facts about refinements


first of all do


Josefa author of refinements I thought


surely I don't know his name because


it's really hard to understand this


Japanese name sorry but that wasn't


Matt's boss from his peers I guess


employer no no idea of why did he need


this feature but initially refinance


former more powerful but due to jury


ruby and the complexity of supportive


payments for JRuby most of the features


were cut and I guess that's the reason


why their sandbox left related to says


all teachers and if you know who's asada


he's working on gills also recording


member and they offer incremental


generator garbage collector was prone to


owned free so he's the one person who


wants to get rid of refinance so


actually even it's this Fisher is not


experimental maybe won't help them and


will be free but no one knows so let me


tell about examples when it's okay to


use a famines when I think it's great


good to you can check Acuras jams he's


also the only person I know who actively


use refinements and in some of his jams


so actually you can find a finance even


such gems like siku it has a refinement


mode instead of monkey patching I don't


know whether anyone use it and we even


had refinements and rails thanks to a


curie again but as for you know rails 5


something this patch was rolled back due


to some problems with finance


unfortunately I come back to this case


in the end of the talk so use cases just


a few examples mostly from my own gems


so it would be easy for me to explain


why I decide to use example so the first


case is dependency reduction I was


working on a jam code anyway can think I


think so


and initially as always it has active


support as dependency there was a lot of


code which relies of core extensions


from active support in order to not


rewrite everything can just edit


refinement which emulates is the active


support behavior


and with just adding one line of code I


now have a gem with zero dependencies


still walking with the same syntax as


before that's the first case when we


want to remove something which were


broken another use case putting a new


one as kind of a coordinated


modernization I want to use new ruby


features but as a gem offer I don't want


to restrict a ruby version to use with


my jam so I like to use a new feature in


Ruby 2.5 called Fred fetch but it's a


it's only existent it only exists and


Ruby 2 point 5 so I'm using refinement


and I think later in a couple of years I


just removed this requirement and can


rely on Ruby itself but without


modifying my code that's it thank you


thank you I think tomorrow there will be


the second part of this ok hi Amy how as


like everyone here is a developer and I


said developer we like to out called


write code and solve problems but of


course I like that too but what I love


is when you can remove code so if you


have a very complex problem project and


you have some legacy code that is used


like in one part of replication and


can't really remove it and finally like


you refer to it a little bit and you get


the green light and obey we can remove


it so I love it like it's a great


feeling like anybody shred this feeling


yeah yeah great but it's like there is a


problem of it usually when we remove


code if you do it just go to the do your


classes and just delete it it's very


easy to like leave something and light


around like it will like


surface like yet later or something like


that so I want to share a few tips like


how to remove like everything completely


like hundred percent and we can use


computer science for this so if you look


at your classes or your code this


basically like the relate interaction so


this is like a graphs so whenever like


one class this isn't another one there


is like a connection like edge between


one node to the other node and it's like


the same of the with methods so one


let's call another this is like the


recognition in graph and we have like


two methods for traversing graphs like


that first search and breadth-first


search so the depth-first search is like


going like one way until you like it's


have nothing else to go and you need to


go back and choose another way and with


breadth-first search you like exploring


like the linear slide edges when


everything is done you go go further so


I prefer like the the breadth-first


search so you can apply the same for


removing code you don't have like any


data structure for that you can have


like the notebook


alright a file you need to just start


from the top from like your top level


class or endpoint you right you like


what you need to remove at the top just


like the breadth first search is using


direct we and Q so you add at the end


you move it from the top so in taste of


notebooks you need to reverse it so you


like at your like first class at the top


a little like everything what is using


every method and other classes you write


it below when you clear it out you just


cross it out and you go next and you


repeat the same process and yeah after


it's done you'd like to complete


elephant but one couple of morphine is


that you need to be aware is like there


is like


translations so whenever you see like


the file and you're removing it and you


see like translation you should also add


it to your light notes or your file and


you know come back to it later


CSS so eagerly from if you remove in


views you should know this is a


JavaScript I think so the classes CSS


classes that are used as their for


binding events she can also put it in


the notebook and then look for it like


in JavaScript and you can also remove


that and the last thing is like the CSS


so like you should put everything in


this in this node and you know cross it


out and tendon in the next thing and


look for dependencies added to the


bottom until you like remove everything


[Applause]


[Music]


so hi my name is Arturo stroke and why


do we love Ruby yeah first of all of


course because we must is nice and


another thing is that unlike pattern


Python developers we are more creative


and we are like like to argue how to


approach certain problems so you know in


the old good times we just used to write


a ruby like that right we used mops


sometimes because we tend to be


functional but then actually a leak


searing came around and whoops we've got


pipe and everybody loved pipe and I'll


show you after that basically Ruby usage


dropped this is at least what I heard


and Ruby try to catch up


Ruby tried to catch up so we tried to do


like referencing methods we try to and


Ruby 2.5 introduced this year itself


which tries to be the new pipe for Ruby


so yeah but it's not everything there is


a missing piece so first I found like my


house one needs keep host introducing


yield and there was like reference to


Ruby tracker issue talking about the


forensic methods so people came with


Psalms a lot of like ideas introducing


new syntax in Ruby to reference methods


in a nice way because we are calling a


method and then brackets passing a


symbol it just not nice so yeah one of


the ideas was mine the last one actually


it was pretty ugly but then this guy see


Ben came and he showed that actually we


can implement something pretty nice


using using current Ruby but you know


it's all about execution so it took the


liberty to execute and we have the


missing piece so basically this is the


way actually use so it also on Nick's


slides today yeah we we can reference


Ruby methods like that but with small


ruby gem week on the reference methods


in that way and what actually this looks


like a cosmetic change but actually this


also gives you like some other nice


features so for example you can have as


a bonus parameter like pre applying


parameters on a method and also yeah


why I would do that like for example you


can reference a private method which


wraps around an object which you fetch


from API and yeah there are others


features like actually you can carry


blocks as well I'm not sure why would


you do that but maybe you can come up


with some nicer api's for some stuff


yeah and this is actually implement the


implementation of an example from my


house post where you just pass method


references in that way I mean it's not


perfect like


you know we can't be a league here but


something it's something right and so


what features we have we have


referencing public methods of other


objects and we have referencing private


methods of self so if you actually with


the default method implementation of


Ruby you can actually reference private


method of another object this is not not


good right we we are not like Python


so actually we prevent that I prevented


with this with this gem so you cannot


reference you have argument carrying


keywords argument carrying blocks


carrying just things and referencing


instance methods in case you would like


that how do you download it just gem


install methods thank you Thanks so this


work oh right okay let's say I'm ready


but I don't know if I'll be in time my


name is magic and I wanted to share with


you some of my thoughts a about two


questions the first question is what it


means to be a developer and the second


question is will computer to replace us


ok so first of all show of hands who in


the room is a programmer nice one and


who is a developer and first question


what is the difference and I think that


it's not that important but to me the


thing is that a programmer is a person


who works with code well developer is


someone who works with problems and


develop some solutions to those problems


so writing code is a part of the job of


a developer at most of developers are


programmers but not all of them so there


are two parts that I like to think like


this duality in developer work which is


there is a part a related to business to


the problem that we are solving and


there is this other part that is related


to code and we as developers must be


fluent in two languages


so we need to speak the language of code


and we need to speak the language of the


client and the second part is something


that more often than not it gets


forgotten or maybe it doesn't get enough


attention so and ii think that really


opened my eyes is that we are also


building mental models so when i work as


a programmer as a developer when i work


with a client then I flex my mind and


try to understand build a model of the


problem that I'm trying to solve and on


the other hand I have some model some


mental model of a solution and both of


these are really difficult to express


and to work efficiently I need to


understand both of these domains and be


able to connect them quickly ok and what


I wanted to say is that we use this


language that I talked about the


language of code and the language of


business to express these two models and


these models are really strongly


dependent on the language we use and if


they are far from each other so we use a


different language in the system in the


code then the language that we use when


talking to the Cree enter and telling


which client uses when talking to us


then we have problems because we use a


crud terminology we say that we are


creating something or removing or


updating or deleting and the client says


ok so I place an order or i I don't know


prepare a shipment and if these are not


represented in our code base then we


need to sit in front of this code and


think a lot about which what is what in


these terms and I think that the


language is this important part and we


have heard about it today because DDD


nails dis perfectly and when we are


doing DDD we are trying to get these


languages and get these two models as


close to each other as is possible so


that it's easy to work easy to relate


them easy to a connect and a Windows a I


come in there is this a duality


makes the part of the developers work in


understanding what people need and


understanding how to solve it how to


teach a computer to do it and the second


part is something that computers are


much better than us so this is the place


where we can get replaced and we


actually are getting replaced constantly


because we are not working with punch


cards or machine code or anything we are


writing in Ruby not in C++ and this is


something we know about so computers


replace us at this low-level work but it


would be really hard for them to replace


us


at the high level at the level of


contact with the client so I want you to


use your imagination and just think


about this even storming sessions and


imagine an AI really advanced AI trying


to participate in this session getting


these postcards putting them on the wall


walking among people listening in what


they talk about and all of the other


stuff and I think that it's impossible


because the AI would not be able to


empathize with these people with clients


with business and business would not


empathize with AI and I think that it's


not impossible for computers to achieve


this ability of understanding people's


needs people emotions but if it happens


job security will be our lowest problem


so just to conclude my prediction is


that not much will change so the


software will thanks a lot


[Applause]