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How To Fix 'Uncaught TypeError: Cannot read properties of undefined' - JavaScript Debuggingwhat's up

SelfTaughtDev

Updated on Jan 19,2023

How To Fix 'Uncaught TypeError: Cannot read properties of undefined' - JavaScript Debugging

what's up guys gary with self.dev today,we are going to go over how to fix,uncaught type error cannot read,properties of undefined,reading has cape or whatever property,you're trying to read,so let's go look at the code and see if,we can figure out what's going on here,in our scenario of this code we are,going to pretend like we made some api,requests and it's sending back,data um i watched the boys this weekend,so our,pretend data has to do with the boys but,we're going to say the api sends back,data about the boys right and it looks,like this it's got a name it's got their,powers and it's got a costume which,describes their costume and inside there,it's just going to have a boolean called,has cape and that's just whether they,have a cape or not,so,we're gonna pretend like we got this,back from an api,and then we want to,say data.for each so for each object,in,this array of data,if they have a cape basically we want to,console.log the hero name has a cape if,they don't then we want to console.log,hero name does not have a cape,now let's go through this line by line,so we can see kind of what's going on,and why this error is occurring,you might be able to just look at it and,be like oh i see why it's occurring but,we're gonna go through it just to,kind of explain it better so data.4h um,we're gonna call each individual object,hero so the first time through it grabs,this object and that is hero and then,we're going to say,hero.costume.hascape so we grab the,object,we look at costume,we look at hascape and that's true,so cool that's true we go inside the if,statement and we say hero.name so,homelander has a cape,and then if we look in here it console,logged homelander has a cape,next time we go through we grab this,second object,it says if hero.costum has cape,so look at the object hero,we look at costume we look it has cape,it's false so we do not go inside this,if statement we go to else and it,console logs hero.name which is the deep,hero name,does not have a cape,third time through we grab this object,and it says hero dot costume dot has,cape,so we look at hero,we say okay um we got hero,there's no costume on here so costume is,undefined,and then we try to get has cape on that,undefined property,and we get cannot read properties of,undefined because we're trying to read,properties of undefined like it's,when we say hero dot costume,it's basically hero dot costume,undefined like this,and,we're trying to access has cape on that,but it's undefined so it doesn't have,cape so thus we get there now how do we,fix that well,um one if you have control over the data,that's the easy or one of the easy,they're all easy ways actually um if you,have control over the data we can just,add costume and has cape and then save,and that will fix it and it will console,log all three things as we expect,but in our scenario um we're getting,this back from an api right so we can't,really control the data that comes back,we can just control what we do with the,data and how we handle that error,so we can use optional chaining that's,one thing um we can just add a question,mark here and that's going to say hey if,costume is it's basically saying if,costume is not undefined then let's try,and access hascape on it right,and then if we save here,we've removed the costume property from,this,and go back and it still works because,it's basically saying hero getting this,one,costume it's seeing that costume does,not exist on this it's undefined and,then it's saying all right cool that's,false so it breaks out of that and goes,to the else,another way you can do this if you i,think this,um was introduced in node like 13 so if,you have to use an older version of node,and you're not able to use this question,mark,a little more,tedious way to do it you can say hero,dot costume,and hero.costum it has cape,because,undefined which is,like when we try to read costume on hero,it's undefined and undefined is a falsy,value,so when it says hero.costume that's,false,and it says okay cool well that's false,this is and,so both of these would need to be true,for us to go in here this one's false,we're going to skip it and it goes down,to this and continues on and let's just,save and go look at our console we can,see there's no errors in there for that,and that's the third way to solve it but,hopefully you're using no or um like a,version that does support this,so,you can just use optional training that,makes it way easier and that'll solve,your problem,but hope this helps you out if you,learned something give me a thumbs up if,you have any questions um or comments,let me know in the description or the,comments below uh if you want to get my,resume template the one i used when i,was applying for tech jobs before i had,any tech experience a link to that is in,the description if you didn't come hang,out and discord and talk tech a link for,that is in the description as well and i,will see you guys next time peace

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undefined n1 twitter catalogs

You Can Count by 1's to 150 | Jack Hartmann
JavaScript Under The Hood [2] - Execution Context
[CppIndia] Smart Pointers - Part 2 (std::shared_ptr & std::weak_ptr) by Shilpa Dodeja
@rae: Existentials and writing functions for length-indexed vectors
M1 MacBooks | Should You Buy 8GB or 16GB of RAM?
Database In-Memory External Tables
Elm - Michael Twomey

You Can Count by 1's to 150 | Jack Hartmann

Tel by my,En jy sal sien,U kan 1 tot 150 tel,Bou jou brein, ook jou liggaam,U kan tot 150 tel,Hier is wat u doen,Beweeg albei arms hoog,1,2,3,4,5,6,7,8,9,10,Swaai arms van kant tot kant,11,12,13,14,15,16,17,18,19,20,Kruis arms,21,22,23,24,25,26,27,28,29,30,Kruis bene,31,32,33,34,35,36,37,38,39,40,Skouers trek op,41,42,43,44,45,46,47,48,49,50,Arm kringe,51,52,53,54,55,56,57,58,59,60,Pomp elmboë terug,61,62,63,64,65,66,67,68,69,70,Bene hurk op en af,71,72,73,74,75,76,77,78,79,80,Swem in die water,81,82,83,84,85,86,87,88,89,90,Chug soos 'n trein,91,92,93,94,95,96,97,98,99,100,Tel by my,En jy sal sien,U kan 1 tot 150 tel,Dinosaur stamp,101,102,103,104,105,106,107,108,109,110,Ponie rit,111,112,113,114,115,116,117,118,119,120,Draf op sy plek,121,122,123,124,125,126,127,128,129,130,Was wasmasjiene,131,132,133,134,135,136,137,138,139,140,Klim op die berg,141,142,143,144,145,146,147,148,149,150,Tel by my en jy sal sien,U kan 1 tot 150 tel

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JavaScript Under The Hood [2] - Execution Context

what's going on guys welcome to,javascript under the hood part two in,this video we're going to talk about,execution context now i just want to,kind of refresh what we talked about in,the last video and what you should know,up to this point so we know that,javascript runs on a single thread the,thread of execution and that thread is,synchronous at its core and any,functions that are going to be executed,are going to be placed on the call stack,which is a data structure that is,last in first out okay so it's important,to understand that up to this point now,we want to go a level deeper into,execution context all right so let's get,into it,all right guys so whenever we run our,javascript code whether it's in the,browser or in node.js it creates a,special environment that handles the,transformation and the execution of that,code and this is called the execution,context it's going to contain the,currently running code and everything,that aids in its execution,now there's a couple types of execution,context we have the global execution,context that's what's created right away,when we create when we run our script,and then we also have a function,execution context anytime a function is,invoked so to help you visualize this,environment just think of a box with,aside from memory which is going to be,where your variables and functions are,stored this is called the variable,environment and then you have your,execution which is you know going line,by line and executing your code now,whenever an execution context is created,there's two phases that happen and it's,really important that you understand how,these phases work so the first is called,the creation phase or the memory,creation phase the second is the,execution phase,so to visualize this you can think of it,as passing over your code twice so the,first is to create memory second is to,actually execute now the first thing it,does in the creation phase is it creates,the global object in the browser this is,called window and node.js is just called,global that's why if i go to any script,and i go in my console and type in,window it gives me my global object and,this has everything from,you know inner width and inner height,properties to the entire document object,so if you're ever wondering where this,comes from it's generated when the,execution context is created,now the second thing it does is it,creates the this object and it binds to,that window object that's why if i if,i'm in the global scope and i type in,this it gives me the same thing gives me,that global window object all right so,it does that and then it sets up a,memory heap for storing the variables,and function references in your script,or in your function okay now when it,stores these it does store the entire,function but when it comes to variables,it stores them as and sets them to,undefined okay so if we go back to this,box here during the creation phase it,will store the entire function but for,single variables it's going to store,them as undefined first and that's,important to know,when it comes to hoisting which i'm,going to talk about in a little bit,all right so that's the memory creation,phase then we have the execution phase,where it just goes uh line by line,executes your code and then whenever it,hits a function,um,whenever we invoke a function it'll,create a new function execution context,so what i want to do now is go over a,block of code and show you exactly,what's happening through the creation,phase and the execution phase and i use,var for a reason i'll talk about that in,a little bit when we get to hoisting,so remember the creation phase runs,first so it's going to go through all,our entire script and just put,everything into memory so line one it,sees we have a variable called x it's,going to allocate memory for that and,the heap and it's going to store it as,undefined because it's a variable next,it's going to look at y it's going to,store that as undefined then line 3 is a,function so remember functions they do,actually get stored the entire function,will get stored all right next we go,down to,line seven sum one is going to get,allocated stored as undefined same thing,with sum two all right so that's the,entire creation phase then we're gonna,start on the execution so it's gonna go,back to line one and it's gonna place,the value of 100 into the x variable,then on line 2 it's going to place 50,into the y variable,it's going to skip when it gets to line,3 it's going to skip that func that,function definition because there's,nothing to execute but then when it gets,to line seven it invokes the get some,function now remember whenever we invoke,a function it creates a new function,execution context so now we're gonna go,into that so you can kind of think of it,like this we have our global execution,context and then inside that is our,function execution context and at this,point the get sum function is going to,be on the call stack all right and we,talked about that in the last video,so

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[CppIndia] Smart Pointers - Part 2 (std::shared_ptr & std::weak_ptr) by Shilpa Dodeja

so good morning and welcome,cpp india i'm ankur satelli i am a c,plus plus,uh evangelist and enthusiast in pune,and very happy to be associated with the,c,plus plus community cpp india,aims to bring together the indian,community to facilitate,sharing learning and expansion of their,c plus plus knowledge,it's a platform to discuss share,showcase your c plus plus work seek and,provide guidance,for c plus plus focused topics,please join us at cppindia.com,at the join us link there you can,interact with the,community on via our discord server,follow us on linkedin twitter facebook,you have all these access mechanisms,noted there in cppindia.com do visit,we organize sessions every alternate,saturday on topics,as per community feedback and direction,and you will today receive,a feedback form at the end please take a,couple of minutes and provide your,appreciation constructive criticism for,the session today,and also guidance on upcoming sessions,that you would be interested in and and,help,us make them awesome,so let's get started with the,presentation,today we have with us,if you are here if you were here a,couple of weeks weeks ago in the,previous session,she presented to us about unique,pointers,and how c plus plus is so excellent,with uh with zero overhead you are able,to get,guarantees of good memory handling,by using you by using unique pointer,and um just,you pay for what you use so,let's get going with smart pointers with,shilpa dodeja,today she's going to cover shared,pointers and weak pointers,shulpa all yours,yeah thank you thank you uncle,let me just present my screen,window,is my screen visible,okay cool,so hello everyone uh,a very good morning to all so this is,the part,two of the smart pointers session,in the previous session we were able to,look into as to what are smart pointers,and why do we need them so let me just,give you a brief recap as to,why do we need smart pointers right,so smart pointers are needed so that the,developers,don't have to do the resource management,manually why because if the onus or the,responsibility is left,onto the developers then there are,chances that our code,might run into problems like the memory,leak the dangling pointers or even worse,like the program clash,so one of the major and the immediate,advantage of using a smart pointer is,that,unknowingly we as the developers would,be writing,a code that is free of memory leaks and,dangling pointers,and will at least save us the,embarrassment of,our program crashing at the client side,now obviously it goes without saying if,we try,hard enough and since this is a cps this,language,then you can obviously still bring back,those issues even by,even while using the smart pointers so,you just have to be little bit careful,as to how you initialize the smart,pointer and then,uh it the smart pointer will take care,of the rest of it,so the way the smart pointers helps us,in writing this,leak free memory code is by ensuring,that the objects are destroyed,or i can say the resources are released,in the appropriate manner,at the appropriate time and the smart,pointers do so by following a principle,called raii which stands for resource,acquisition,is initialization so this principle,basically states that,if there is a resource that needs to be,managed and this resource,is bound to a particular class like it,it is it has become a member of some,class and,inside the constructor of the class if,we acquire that resource and hence the,name,resource acquisition is initialization,and in the destructor of the class we,free or release that resource,then we are following the principle,called raii,this in practical terms this principle,basically assumes or gives the,ownership of the heap allocated resource,or any resource for that matter,to a stack a located object so when the,stack,object goes out of scope the,corresponding or the underlying resource,will also be destroyed or released,whatever the case is,so there are three smart pointers,available in c,plus 11 standard unique pointer the,shirt pointer and the weak pointer,in our previous session we were able to,look into as to how we can use this,unique pointers and uh to give you just,a quick recap,unique pointer will always have the,exclusive ownership of the underlying,object that means it will be the only,owner of that underlying resource and,when that unique pointer goes,out of scope the underlying resource,will also be destroyed or,released now the beauty of the unique,point is that it is,as light raised it is as lightweight as,a normal raw pointer,so there is no memory overhead as such,if you want to move if you want to know,more about the unique pointer then you,can obviously check the,recording of our previous session on our,youtube channel,are you able to see now this,thing the three types of smart pointers,available,yes yes yes yeah okay cool,thank you um sorry sorry so,yeah there are as i was saying there are,three smart pointers available the,unique pointer,shared pointer and th

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@rae: Existentials and writing functions for length-indexed vectors

hi everyone today we're going to resume,our,series on uh on translating functions,from data.list into length index vectors,so this is an exploration,of type level programming in haskell,and so the past couple of weeks we've,we've started to build up all of these,functions,um by the way there's a the code that,we're gonna see today is posted online,there's gonna be a link uh down in the,description,and and so today's this is our fourth,week of doing this so so far,we've seen how g80ts work a little bit,we've seen how singletons work a little,bit and we've seen how type families,work a little bit,today's subject is going to be,existentials and before you get scared,off,um at the at the long time on this,um there's going to be sort of a natural,breaking point we're going to do a,simpler example and then i want to do a,little bit more of a long draw,drawn out example so but if you just,watch the first half,uh or so then that will be that would be,good enough um okay so let's let's dive,in oh and by the way you don't need to,watch,previous videos to be able to understand,this one i try to make them each uh sort,of independent,the key the key definition is the one,that we see on the screen right now and,actually what i'm going to do is,let me keep that up on the screen and,let me see if i can get emacs to do this,um i think that might do it there we go,so now we can keep that up there and,then we can just work down here this,will be enough space,and the function i want to look at today,is where is it,where is it is filter so let's take a,look at filter,so if we think about filter filter on,lists has a very nice type,looks like this,and the idea here is that we're going to,get a predicate of type a arrow bool,and then we want to keep all of the,elements in this input list that meet,the predicate,the challenge with length indexed,vectors though,is that we don't know how many elements,in our vector are going to meet the,predicate so we can't say how long the,output is going to be,right if i just do a naive,encoding like this well that's not going,to work out so well,because my output length n is not going,to be the same as my input length,so i'm going to say okay so fine let's,just make the output output length,different,so let's let's actually write this uh so,we're gonna get a predicate p,and let's see oh if it's empty then,we'll just return empty that's easy oops,i don't call it,that that's very silly i call it this um,and then we don't need that p and then,here if we have x con or x cons,x's then if p x holds then we want to,keep,x so we're going to do x cons filter p,x's,and otherwise uh let's see otherwise,we're gonna go,just filter pxs okay there we go,now if i try to compile this i get an,error,um oh not in scope otherwise,oh well that's very silly a lot of,people think otherwise it's a keyword,it's just defined to be true,um let's see if we can get a more,interesting error down here,uh could not deduce m equals second zero,is there anything is this one simpler oh,yeah let's just use let's just use this,first one could not just use,m equals zero from the context n equals,zero right so,it's looking like i'm saying here that n,and m are going to be two different,lengths and they are different lengths,but the way that that all of this stuff,works is that,n and m are both chosen by the caller we,can think of,n and m and a for that matter as extra,parameters,to the filter function so every time we,call a filter we have to choose what is,a what is n and what is m,most of the time ghc just does this,choice for us we don't really have to,worry about doing it,but if we think about these as inputs,well there's nothing that says,that this result type m is going to be,zero just because the input is zero,right there's nothing tying these two,together,on the other hand we do know that n is,zero if the input,is empty oops we've lost vec up here,let's take a look at it again,right if we've pattern matched on nil,then we know that,n has to be zero so that's all well and,good but we don't know anything about m,so this type is just not going to work,out for us,instead what i want to do is i want to,say that there exists,some m such that the result is going to,be vec m,a and and this is in contrast to sort of,the,default quantification in haskell which,is for all,right so we're going to say that this,works for all n a that we take these,inputs and then we're going to produce,some vector vect m a such that there,exists or there exists m such that we,get,we get this result the problem is that,exists,well it doesn't um so today in haskell,we can't write exists,the same way that we can write for all,but i'm actually going to have a link in,the description there's a paper,that i've submitted for icfp early,reviews are looking positive so i'm,hopeful that that it's going to get,accepted into icfp,that actually describes a way we can,work exists into the language there's,going to be a link for that in the,description,um i don't want t

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M1 MacBooks | Should You Buy 8GB or 16GB of RAM?

so if you clicked on this video you're,probably one of those people right now,on apple's website,trying to decide whether you want eight,gigabytes or 16 gigabytes of ram,you're probably filled with a lot of,anxiety and you're unsure whether,eight gigabytes or 16 gigabytes is the,right choice for you this video is to,help you,make that decision so right off the gate,i'm going to come out and say that i,don't have the 16 variant model,but before you leave this video do hear,me out because i do believe this video,is going to help you make that decision,now right off the bat i want to say that,if you're thinking that 16 gigabytes of,ram is going to net you,much more performance than 8 gigabytes,you're probably going to,want to get a reality check and realize,that it's probably not going to do that,for you,now the second use case or the most,common question i see,is if i get 16 gigabytes of ram is that,going to help me for longevity,the short answer is yes the long answer,is,but do you really need 16 gigabytes of,ram,for your workflow now for the college,students trying to decide whether you,need 8 or 16 gigabytes,and your use cases using you know the,microsoft suite,opening up a lot of chrome tabs watching,stuff on netflix,you're okay with 8 gigabytes 100,but another thing i want to mention is,if you don't really know,what ram is and i'm not trying to say,this to sound rude or arrogant,but if you don't know what ram is,chances are you probably,don't need 16 gigabytes of ram as a,shopper i know it's difficult when you,have,options in front of you and when you're,on the website and you see that,16 gigabytes is 200 more what can i get,out of that 200,if you're expecting like raw performance,you're not going to see,that from your ram now from people who,are,asking in the aspect of will this,computer last me longer,like i said before short answer is yes,but i do,want to put something else out here so,in apple's newsroom which is where they,released their press release,articles and i'll have this article,linked down below this came out,i think 10 days ago when you look at,this article when it's talking about,m1 look up the word big sur and you will,see that big sur and,m1 are almost always in the same,sentence,we also have to take into account that,big sur is,engineered like they said down to the,core 4m1,and even with the number change which is,really shocking to me how they went from,10 to 11.,big sur is a pretty big shift as well,and that's something else that people,aren't talking about,when you combine m1 with big sur,you realize how efficient mac os is i,mean mac os was already pretty efficient,with memory management but now more than,ever with big sur there are things that,used to take me 16 gigabytes on my older,machines that,somehow with the 7 core 8 gigabyte,variant of the macbook air,i'm able to do crazy amounts of things i,don't use the word crazy,i'm probably over exaggerating but i'm,able to edit like my 4k,workflow no drop no frames but do keep,in mind i'm using final cut so it's,optimized,for m1 apple software has always been,really efficient on the hardware uses,that,they're allowed to use even when you,compare ios to android even though we,have six gigabytes of ram in our iphones,now in the pro models,and android phones have like 16 even,faster ram,you still realize how efficient apple is,with their ram and that's because,everything inside the phone or,not everything inside the phone the soc,or the a series processor,inside their iphones they're able to,utilize the hardware and the software to,know exactly,where to put things even between mac os,and windows,and people who have used both you can,leave your comments down below but in my,personal opinion i,always find mac os just to be more,memory efficient,across the board there's not as much,overhead running on mac os,and even with this new redesign in,engineering,of big sur with m1 that memory,management has been,even further it's more efficient,than before which is shocking so moving,forward i do believe that,you know the whole this computer needs,16 gigabytes of ram or it's dead on,arrival,is not really applied to these m1,macbooks,with eight gigabytes of ram i do think,that a lot of people are going to be,okay,now for people who do need 16 gigabytes,of ram,here's what i'm going to say you're more,than likely a developer,developer i would say this audience is,more than likely,developers or professional people,working in the field,you're more than likely trying to build,an application or you probably have a,hobby where you're trying to create,something that more than likely needs a,lot of horsepower in terms of,memory and you probably know if you need,16 gigabytes of ram,if you feel more comfortable having 16,more than eight,then more power to you i completely,agree i would spend the extra 200,just to have that peace of mind that i,have 16 gigabytes of ram,you guys also have to take into,consideration that this is the first,generation,of m1 and the

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Database In-Memory External Tables

hello um hopefully roger will attend uh,he's around i know because i saw,some email and twitter from so roger,nichol who actually was one of the,primary developers,for external tables hopefully he'll be,there or join us uh my name is andy,rivenas excuse me i'm a product manager,with database and memory and welcome to,our database and memory uh asktom office,hour sessions where we're gonna,talk about uh external tables and some,of the new features that have been,added in 21c we'll do some demos and um,uh anyways,the our landing page which you would,have,used to join the session today just like,to remind folks,that um,we do have our previous,office hours sessions and we've actually,done quite a few of them now,so you can click on those and and view,those,in addition we have our resources i've,got a list,our blog and our resources page on the,blog which has lots of information about,database and memory,our live labs environment,in-memory advisor if you want to look,and see if maybe,database memory would provide value in,your environment against your,existing workload it uses awr and ash,data,we've talked about that the,documentation and of course all of our,other collateral that describes how,database of memory works and um,how you can make use of it so,with that i think we'll,dispense there,and we'll get started again i will uh,keep an eye out for,roger he may have had trouble it's the,first session he's done with us so he,may,be having trouble connecting,um but we'll see we'll continue on so uh,again welcome so let's uh,my email address is there and you can,follow me on twitter uh roger's email,roger actually does quite a few um,user group sessions as well so you may,have seen him do that or may be familiar,with him,in his,he does twitter he's on twitter and um,had his own blog which we've,kind of resurrected within the database,of memory blog,there was a bunch of changes with,blogging at oracle and i think he,some of his blogs or his,session or the area he had disappeared,but with that we'll go ahead and get,started and let me,go ahead and feel free i will try to do,dual duty and feel free to,put questions in the chat i may,only,handle those questions at certain times,and since i'm trying to do two things at,once,and let's go ahead whoops i'm let's get,started,um we did do a a,a previous askton session on 21c new,features where i did touch upon external,tables we're going to go into a little,more depth today,and then uh looks like maybe i didn't,get oh yeah and then uh roger did a blog,post on 18 c,with uh in my external tables it's like,i might not have put the title there,sorry about that and then um,then our 21c blog post that talks about,um,that i did that talks about,partitioned table support and hybrid,partition support or hybrid table,support uh so um and then of course we,have the memory guy the documentation,for uh all of the releases,and again uh any and well we'll just,continue on because i have uh,so we introduced,the support for external tables in 18c,oracle database 18c but that only,allowed you to,define a standard external table,within a database of memory the,advantage of course is that you don't,have to materialize the table first in,oracle database you can directly,populate an external table from you know,external files right into the column,store so,that was uh,something that folks have been asking,for it's the advantage is that you can,then,um operate on that data along perhaps,with uh internal data with all of,oracle's rich sql functionality and,maybe your other application so it was,something that folks had been asking for,and that we were able to um get into,starting with 18c get into the into the,product,and uh and then in 21c we introduced,enhancement we added partition tables,because folks really wanted to have the,ability to have partitioned external,tables and then we also support hybrid,external tables which had first been,introduced in 19c which allows you know,a hybrid external table those allows you,to have a mixture of external partitions,and internal partitions and we'll kind,of show you that as well so that was uh,kind of exciting,if anybody's going to ask that's at this,point that's there are no plans to,backport that support to 19c,we kind of opened the floodgates with,requests for back porting we did the,base level feature,we've relaxed some of our licensing,restrictions but at this point,it doesn't look i don't think there's,any movement on,trying to backport,this support so,this is a 21c feature but we'll be going,forward obviously,and so my first example i'm going to,show you because i think it's easier to,see on the slide the,table syntax that i use i've already,created tables and i've already,populated,for the internal partitions on the,hybrid partition table or hybrid,external tables um i always want to say,hybrid partition table but,the,the tables so that we don't have to go,through the effort of trying to create,that and,and load up the examples so we'll be,rea

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Elm - Michael Twomey

oh yeah can everyone hear me after warn,you i tend to trail off especially when,i'm tired and i'm very tired so i tend,to kind of like talk really loud and,then slowly trade away so just how do i,do that so i I've started the Elm user,group in Dublin I basically I started,programming in Elm probably less than,six months ago so I've been sort of a,bit of a language nerd for a while and,I've been sort of looking for a nice new,language to play with an elm is to me a,really interesting language in one worth,looking at so I'm going to talk about it,now I have to warn you I don't have any,nice frog demos and it's mostly going to,be me talking a bit about language is,going to try and keep it moving faster,doesn't get too boring and so without,further ado what is l so I mean that's,it that's the talk it's just the best,functional programming language in your,browser what does that mean so I kind of,get a lot of questions about elm it's,basically it's it's actually a full new,programming language it's not like,JavaScript with extra bits it's actually,completely new programming language it,has its own compiler it emits JavaScript,I'll get onto that but it's actually a,ml inspired language using Hindley,Milner type inference whatever that is,and it's basically strongly typed it's,actually trying to make life more fun,for developers it's actually not trying,to be an academic language it's actually,going to be really really useful,language that you can actually use and,to do that I just say it has a full,compiler tool chain so you actually do L,make and bland and emits a single,javascript file so what it compiles,everything the best way to thing is let,go it comes start and compiles all its,libraries into one binary and which is a,single javascript file you just include,and you can actually just compile it,separately and treated like a library if,you want and so with that regard it's,actually kinda nice to integrate so what,is l I mean so it's as I say it's a,functional programming language I mean,it's not this this basically doesn't do,anything too exciting it shows hello,world,whoo-hoo and so what this is doing is,it's got a main it shows hello world,show is just a graphic shortcut just,renders the string and there's a type,annotation here I'll talk a little bit,more about those in a minute and funny,we're talking about centering and so elm,one of the things it can do is it can,react to events one of the events is,actually the window size so hopefully,I'm not going to be made a liar of and I,can resign as you resize as an event,being generated Elms reacting to in a,tree centers the content so it's,actually it's a pretty good for doing,stuff like that so basically this is,kind of starting to show you the whole,thing about elm it's a functional,reactive programming languages actually,as math the guy great Evan it was his,master's thesis can you make a,programming language that takes the,ideas of functional reactive programming,and ml other functional programming and,which other stuff II read smush them,together and make them into a nice,language that we really cool for writing,from 10 programming in my contention is,yes but you know we'll see what everyone,else thinks and here's another one,featuring my favorite operator in the,whole wide world that every language,needs to steal which the pipe forward,operator and this Basie way to get rid,of brackets instead of nesting brackets,with 15 function calls you just do pipes,just like a UNIX show and what this one,does is it makes a bigger hello world,exciting so one thing you may have,noticed is this isn't really doing HTML,there is actually a HTML Dom virtual Dom,shenanigans going on but elm actually,presents a two or three different ways,you can do it you can do it like a,graphic style so it does canvas you can,do these elements which are basically,abstractions over HTML and then you can,just straight-up HTML I nope and elm is,a a continual struggle to balance,language design so the idea is trying to,make add a nice stuff but not too much,because then it gets complicated so,that's what large part of yale design is,always about not was actually now,removing features so as I say the elm,philosophy and the reason I'm talking,about the language this is kind of L,makes a lot more sense when you see,later,philosophy behind it and it's basically,to make a language with front-end,developers they actually the Elm folks,proof he must eschew doing back end,they're going mouse I'm gonna probably,do it eventually but we're not going to,do that and if it means compromising the,front-end experience we're not going to,add those features so everything they,actually say they kind of say no more,often than they say yes on the mailing,list it's actually very funny sometimes,and where someone comes in going hey man,how scale developer it's just brilliant,language construct you've got to have,because the best thing ever and they say,no it's just confusing it doesn't make,any sense so the other

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