Build Your First Blockchain App Using Ethereum Smart Contracts and Solidity
ฝัง
- เผยแพร่เมื่อ 27 มิ.ย. 2019
- Learn how to build a blockchain app using Etherium smart contracts in this full tutorial course for beginners. You will learn how to create a todo app with Etherium smart contracts using the Solidity programming language. You will also learn to write tests, deploy to the blockchain, and create a client-side application.
💻 Code: github.com/dappuniversity/eth...
🎥 Course created by Dapp University. Check out their TH-cam channel: / dappuniversity
🔗 Dapp University Free Blockchain Developer Training: www.dappuniversity.com/bootcamp
🔗 Full-Length Article: www.dappuniversity.com/article...
⭐️ Course Contents ⭐️
⌨️ (0:06:34) Install Dependencies
⌨️ (0:09:26) Project Setup
⌨️ (0:22:47) List Tasks
⌨️ (1:05:07) Create Tasks
⌨️ (1:16:40) Complete Tasks
--
Learn to code for free and get a developer job: www.freecodecamp.org
Read hundreds of articles on programming: www.freecodecamp.org/news
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The most amazing thing that could happened is that you forgot to run the migrations! It was very educative! 🤓I'm not going to forget to run migrations next time 🌟
Great video! thank you!
Thank you. It works for beginners. thank you a lot
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There is so much one needs to already know in order to follow your tutorial
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Amazing tutorial thank you very much
Great walk through Thanks!
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Wow! Seems like a great course. Im going to start this after I finish your MERN stack tutorial!
LOL me too in 2021
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thank you for this amazing course
I am having trouble downloading truffle though the terminal. Would you be able to help guide me? I can send you the terminals response to my input
use sudo
if u are using windows and u encountered "rollback failed" then try to restart pc after installing node
Thank You!
Hi , This video helped me lot as an entry point to learn smart contracts . But can you please explain about `string memory _content` can't i jut use ` string content`.
Great content!
I honestly can not thank you enough for these videos.
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Can you do a xml tutorial please!!??
Excellent video which pulls a lot of concepts together. Really needed this and feel my knowledge has supercharged forward!! Thankyou Greg -brilliant.
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Is putting a to do list on the block chain the right use case for the blockchain?
Thanks greg for that video. Is it possible to achieve the same results with the web3 PHP version? Thanks!
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thanks, i just message her now and she is directing me on how to start trading
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"Trading with an expert is the best strategy for newbies and busy investors who have little or no time to monitor trade.
"How do i reach her?
@Lei Wei "tell her i referred you.
"You can search her on google she's verified.
This is an amazing tutorial to practically implement features of blockchain. Love the effort, thank you so much. Please keep posting!!
Hi
@@harishchand2329 why man, that desperate?
Can you please tell me basic blockchain reactjs project in youtube ??
Did you implement this ?? did it work?
@@asutkarshrushti6806 yeah I did, it worked
But this was long back
The best channel
Hi, i love your work
Hey, can you please make a trutorial on blockchain app for Escrow Smart Contract ?
I would love to watch it as well.
You are accessing the MetaMask window.web3.currentProvider shim. This property is deprecated; use window.ethereum instead. how can i solve this error. This was showing in developer options in the web page
Hi loving the course, I really want to know how your terminal looks so nice
Its mac
gonna deploy this on real etherium main chain and spend around quarter cents per todo to note down my tasks. that's a small determination fee to complete them
Nice content Gregory 👌
Nice video. A sturdy foundation ensures overall success and this is what having a mentor brings.
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So much insight to be gained from this video.
And One takeaway for me is that trading without a guide amounts to financial suicide.
Way to go, mate! You wrote my exact thoughts. Trading under the guidance of a professional will definitely reduce my exposure to risk
How do I go about finding a good professional who can put me through the use of financial analysis to determine what crypto to buy?
I've been dabbling a bit on my own. Guess I'll need to find myself a crypto guide
Thank you very much for the video. Much appreciated!
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So does the user pay ether every time he updates or changes his todolist? Does it cost ether to retrieve todolist information from the blockchain?
it's just an example, I don't think there is any real life purpose to tie your to-do lists to etherium block-chain.
Hi, very good video.
I am building my own coin with ETH Smart Contract.
Actually the current price of the coin will not be the concert of smart contract??
How did those smart contract coin able to have a price? Can you tell me?
Hy ! In toggleCompleted method, why I can't I access it directly by tasks[id].completed and then setting it to !tasks[id].completed ? What's the need of declaring it's datatype as 'Task' ?
Having adequate orientation or knowledge about bitcoin trade or any other cryptocurrency is a key to a profitable and a successful Investment. I can unequivocally say that Forex and crypto trading is one of the most profitable and lucrative business for every Investors with the right expert..
Well I must say people are scared because there are so many unprofessional brokers out there.
That's true a lot of people today have been having a ton of disappointment in stock and Crypto Trading in light of helpless direction and awful specialists
I think I'm blessed because if not I wouldn't have met someone who is as spectacular as Expert Meghan Taylor
She has been handling my account for years now.
@@damienbenjamin4383 Wow I'm just shocked someone mentioned and recommended Expert Meghan Taylor, I thought I'm the only one trading with her.
In Windows instead of touch , use echo $null >> package.json
Or just use WSL 2 😉
Tks you very much
thank you this tutorial is pretty helpful
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Also the best platform for beginners, with no knowledge in investing
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The Market has been pretty bad until today it decided to surge. Everybody was Practically Crying then. It kept dipping. That's what you get when you feel you can navigate the process on your own. Big thank to Ryan Willer. I'm not bothered with how bad the Market is because my assests are insured due to his advice and I still receive my profits
Ryan Willer is very resourceful and helpful to me as well. I started trading a fairly small account and i got over 200% within one month. We need more traders like him in the space to guide the teeming population of crypto enthusiasts and traders out there..
but honestly a lot of people thinks crypto is luck, if you don’t know what you are doing and you don’t have guidance. you will loose your money to crypto. i have been there that was before i met Ryan honestly he brought light to my trading story
a novice can’t do it on their own, and also there is different from buying and holding, and trading. holding is like keeping money in a bank, trading is for people who want’s to make money. and you can’t do that without understanding the market..
Trading and minimizing losses was also possible for me thanks to Ryan Willer's daily signals and guidance
If you are serious about making awesome profits and increasing your portfolio i will advice you to contact Ryan Willer, he's good at what he does. I recommend him because he is the best signal provider I have come across.
ohh man great content
Thank you man
I followed everything was working fine but i had to restart pc and after that i am unable to view tasks
also TX count count increases everytime I create a task but balance isn't changed at all
It is however deducted in the meta mask extension
I have tried cleaning browser cache and importing new account also I have restarted and serve again
Anyone facing the same problem : I solved it by running migrations again and it updated my address which was not being updated
Little question:
In both Chrome and Firefox despite having set up metamask I get "Web3 is not a constructor". How would I fix that?
Think I fixed it.
Solution:
in the header of the index.html
And
var Web3 = require('web3');
at the top of app.js
@@Thandidladla thank you for this.
I have been trading for about 6 months now and just about every trade backfires and slaps me in my face. Nearly impossible for me to catch more than a few points . I try to do top down analysis but it doesn't work for me . I say to myself, clearly I'm in the 90% that lose money, so I open a demo account, do my analysis, then take the opposite of what I would normally take and get the same result. I'm starting to feel hopeless, any advice for a struggling trader?
@Ray smith You're correct, I don't lose money every single trade, but my main problem is trying to let my runners run. Very rarely do I catch big moves . Instead they go a few pips in my direction, then go against me if when I try holding them. Also my entries could use a lot of improvement. A mentor would be amazing, but getting one is easier said than done. If it's not too much to ask, do you know any legit ones?
Thank you!!!
great thanks!
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Great video! These courses have helped get a quickstart with this technology. I still have a question tho, if this dapp was deployed to the real world, the Todo list would be global? Like anyone who enters a new task is adding it to the same global list.
In this implementation specifically yes, it would be like that. There is a way for each address to have their own list of tasks though.
A very nice course, must for the blockchain beginners :)
I'M NEW TO CRYPTO TRADING WHAT'S THE BEST WAY TO GET STARTED WITH TRADE COS I'VE BEEN MAKING MY PERSONAL RESEARCH FOR A WHILE NOW I DON'T KNOW HOW TO TRADE ON CRYPTOCURRENCY ?
As retail traders, this highlights the importance for
understanding what conflict of interest exists when people
create content around any specific trading platform/
strategy.
As a beginner who don't understand how Bitcoin
trade really works and you really want to make profit
from it. I will advise you to first start working witha
professional broker
This thing about been successful has to do with
working towards your goal and not giving ears or
attention to side thoughts
How can someone know a professional business account
manager that is trustworthy and legit they are hard to
find this days
I highly recommend Mrs Olivera Jane okhumalo, she is my
current trader and her strategies are working
Let me see your professional advice one more time. pls share your judgment about GraphLinq. When shall I buy GLQ ?
You are awesome! I understood most of it, LOL. I'm sure that after I rewatch it 20 more times I'll get it.
Thank you.
Hey Gregory, thanks for this tutorial, please help me with this:
TypeError: Web3 is not a constructor
Uncaught (in promise) ReferenceError: Web3 is not defined
Do you have any idea? Thanks again!
Hi, I am getting the same error. Did you find any solution to this?
In your package.json you need to:
1 - add "dependencies": { "web3": "^0.20.6" } (at the bottom of the file)
2 - on the index.hml file add (just before )
3 - run command -> rm -r node_modules package-lock.json (deletes the folders node_modules and package-lock.json)
4 - run command -> npm install
thank you in advance for your perfect videos. Whenever I go to Bootcamp there is nothing there! just user name and email and then again nothing. I need to use the code there
This is awesome 👍😎
that moment when you pay 25 cents to tick off an item on your todo list.
HAHAHAHAHAHA
this app will help a procrastinator a lot.
I wonder how much it is now
@@alejandroguzman4619 try to predict howmuch it wil be worth 10 yrs from now when the last 1000 coins of Bitcoin will be mined
@@dipeshdebnathltd Crazy to think about
Interesting demo app. Also interested to learn why would folk use blockchain tech as a random distributed db backing a web app over say Mongo?
Well blockchain apps are definitely not better than db apps at the moment!
Dapps has so far meant only gambling applications.
Right now gambling apps seems to be only use of blockchain appmaking!
But the reason why I think people are trying to plug blockchain into everything is due to the "possibility".
To escape big technocratic censorship, relinquish trust to cryptography rather than fallible humans, and to create virtual decentralized economies,nation states eventually.
Great presentation. So NFTS minted on Polygon have to list price in Matic ? or it can still sell using ETH and whats the cost to buyer if it priced on ETH but minted on Polygon?
great video, I have a question tho. did anyone have any problems with getting the right complier for truffle in vs code?
Hey just want to know if this tutorial still works
@@arohirathore9197 ya bro it works fine
Excelent video, but how I can deploy all this in production environment?
Forget this how to create that jawline
he's obviously using the Mike Mew framework
Thanks for Info.👍
Hello which editor you were using to edit .sol files? because when i open it in notepad, it converts to text file. I need C type file .sol as you showed in video.
I undeniably
Trading with an expert is the best strategy for newbies and busy investors who have little or no time to monitor trade.
I strongly advise you against self trading, it's really dangerous and had brought so many investors down, you need someone with the knowledge and strategies, someone dedicated to the crypto currency market business, and I will strongly recommend expert, Mrs Debra Dianne Brooks.
How do i reach her ?
@@nenajurgen5927
I stumbled upon one of her
Does anyone know why
I would be getting an invalid address error when I enter a new task in the Web app?
It works in the console and
onsubmit works on its own,but when I put it all together I get this error and I'm unable to add new tasks via the Web app- only through the console
Hey have you found a solution to this.
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Also the best platform for beginners, with no knowledge in investing
Its legit and secured
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you are yet to set up the provider:
await App.todoList.createTask(content,{from:App.account})
@@autoclicker2963 Still not able to add , my tasks arent visible
@@autoclicker2963 after setting the provider as you mentioned, everytime I add a new task, the metamask extention pop out and ask me to confirm the create-task action. Is there any way to make action automatic without confirmation?
Hi i love your work
Great project
Did anyone actually follow the entire tutorial and finish this course?
did you?
@@anirudhkannan9 I got stuck and wasn't able to unblock myself so decided to start another project.
hello there, I keep getting these errors when I try to use web3 : "Web3 is not defined", "Web3 is not a constructor". Can someone explain me why?
I am getting the same error.
make sure web3 is installed by running npm install web3 and added as dependency and include the script file in index.html
@@ShashankMestry thanks a lot, it worked for me
thanks a lot sir
@@ShashankMestry thanks a lot sir
Thanks for the information, the truth was a sensitive issue.
Awesome. THX.
if you get App.account is undefined, use
loadAccount: async () => {
// Set the current blockchain account
web3.eth.getAccounts().then(function(result){
App.account = result[0];
console.log(App.account);
})
},
I can't find any private network in metalmask?
Great job, thank you!
I love when he sows the the eth wallet (2021 got him good) XD
Please I need someone to help me trade or invest the forex or crypto market because I’m tired of trading in losses myself. I’ve blown my account twice and it’s frustrating…
@Jonathan Eric Wow I’m amazed you mentioned Mrs Tracy Williams she is the best and her strategies works like magic. I’ve been making over 300% of my investment weekly since I started investing with her trading service.
@Jonathan Eric I will also advise you try Mrs Tracy, she is legit and her profit scheme is amazing, I’ve never seen any of her clients complain of lost
@Sandra Well, you are saying the fect. invested $4,000 with Mrs Tracy, and earned $12,000 in 7 working days.
@@patrickjohn7423 Mrs Tracy has really made name for herself. I invested $10,000 and earned & 34, 000 in am in am interval of one week
@@johnnycharles4163 I’m also benefiting from Mrs Tracy I was afraid of investing with her platform until I got convinced by my cousin who linked me up with her and since then I’ve been earning at least $4,000 profit weekly from every $1,000 I invest.
10 minutes into the video, found how illiterate I am... understood nothing
That’s the first step, figuring out what you don’t know! Keep going!
getting this error message :Failed at the ganache@2.0.2 start script.
saying the node which I just installed/updated/upgraded is not compatible with ganache2.0.2
Thankyou for this i have an idea 💡
So as a music nerd I think I would reference your smart contracts like we reference plugins. They can go and stand on their own and do other things or they can interact with this host or that host or whatever. Fucking brilliant really.... I'm entranced by this technology
I can appreciate that analogy.