Introduction to Ethereum Smart Contract Development with Solidity (Part 1)
Why Ethereum Stack Exchange recommends it
Ethereum Stack Exchange users link it as a beginner-friendly walkthrough of Solidity and Truffle, and many later questions cite it as the HelloWorld/MetaCoin tutorial they were following.
Recommended by 4 people across 3 different months, 2017 to 2018.
What it is
A 70-minute hands-on tutorial in which Will Warren walks host Decypher Media through setting up an Ethereum dev environment, writing a hello world Solidity contract, and building a metacoin from scratch. It uses the browser Solidity compiler and the Truffle framework, covers deploying to a local environment and the live testnet, and touches on basic contract design patterns.
What people said
Recommends EthJ · 2017-03 · Ethereum Stack Exchange · on “Where to start with Solidity?”
I would recommend using Truffle for testing and writing your contracts. [LINK] These videos helped me to get started and work out the development process using truffle: [this video]
Recommends Sanchit · 2017-06 · Ethereum Stack Exchange · on “Can someone help me get started on the Ethereum platform like all the basics?”
I started with the help of following links and tutorials, that may help you as well. My aim was to learn Ethereum and blockchain basics and then start DApp development quickly. Blockchain Whitepaper: [LINK] MIT resources on Blockchain: [LINK] Blockchain essential course by IBM: [LINK] Ethereum Whitepaper: [LINK] Geth: [LINK] (one of the Ethereum Client) Solidity Documentation: [LINK] (Go through with it before writing smart contracts) DLT Labs YouTube video on Ethereum Basics - [LINK] Udemy Course of Ethereum DApp development(10$ only) - [LINK] Videos from Jordan Leigh - [this video] , [LINK] Hope this helps.
Recommends Justin Thomas · 2017-06 · Ethereum Stack Exchange · on “How to interact with a greeter contract?”
From this video: [this video] I discovered Truffle ( [LINK] ) Couple of things on life cycle: The contract creator pays gas to get the contract into the block chain. If the method or access is constant, the client and do the operation. Constant operations do not modify the block chain, so they are free. If the method is not constant, then it costs gas to run it. Some code using web3 on node console: # Beware the promise > var helloWorld; HelloWorld.deployed().then((a) => helloWorld = a); # Free > hello.balance.call() # Not free > hello.getBalanceBaller.sendTransaction() '0x7acb7577a8623090b4f648203f2ecfc2e0689e011f100edef212872fe9e917f7' > hello.balance.call() { [String: '412'] s: 1, e: 2, c: [ 4
Recommends smatthewenglish · 2017-07 · Ethereum Stack Exchange · on “Problem with Truffle Console: Cannot read property 'call' of undefined”
this answer is what you need to get the results from the console that they demonstrate here: [this video] @BadrBellaj nice work :)
Recommends Sanchit · 2017-07 · Ethereum Stack Exchange · on “Learning Ethereum development? & idea possibility?”
I started with the help of following links and tutorials, that may help you as well. My aim was to learn Ethereum and blockchain basics and then start DApp development quickly. Blockchain Whitepaper: [LINK] MIT resources on Blockchain: [LINK] Blockchain essential course by IBM: [LINK] Ethereum Whitepaper: [LINK] Geth: [LINK] (one of the Ethereum Client) Solidity Documentation: [LINK] (Go through with it before writing smart contracts) DLT Labs YouTube video on Ethereum Basics - [LINK] Udemy Course of Ethereum DApp development(10$ only) - [LINK] Videos from Jordan Leigh - [this video] , [LINK] Hope this helps.
Cites Othman Benchekroun · 2017-05 · Ethereum Stack Exchange · on “HelloWorld contract using truffle v3.2.1”
Can't believe I found answer on a youtube video comment : Truffle change to call this way HelloWorld.deployed().then(a => console.log(a.address)) link to the youtube video : link [this video] Which mean in my case HelloWorld.deployed().then(a => console.log(a.balance)) , or HelloWorld.deployed().then(a => console.log(a.balance.then(console.log))) , to get answer directly So yes truffle changed their way of accessing contract in newer versions, they should update their doc
Cites kris · 2017-07 · Ethereum Stack Exchange · on “truffle always says ".my_function is not a function"”
I'm trying to do my first basic smart contract, following this [this video] popular HelloWorld tutorial. However whenever I get to the part where I run a function in the truffle console, it is always telling me ".function_name is not a function". For example, calling the default truffle MetaCoin getBalance function : truffle(development)> MetaCoin.deployed().getBalance( web3.eth.accounts[0] ) TypeError: MetaCoin.deployed(...).getBalance is not a function Am I calling the function incorrectly? How should I be calling the .getBalance function in the MetaCoin example?
Cites Van Minh Nhon TRUONG · 2018-03 · Ethereum Stack Exchange · on “Problem with truffle console : Cannot read property 'call' of undefined”
I have a problem when executing the code HelloWorld.deployed().balance.call().then(console.log) This error introduced: Cannot read property 'call' of undefined This problem is similar to this thread [LINK] but it does not help on my case. [LINK] Thanks for your help! My code is from this turorial [this video] contract HelloWorld { address public owner; mapping (address => uint) balances; function HelloWorld() { owner = msg.sender; balances[owner] = 1000; } function transfer(address _to, uint _value) returns (bool success) { if (balances[msg.sender] < _value) { return false; } balances[msg.sender] -= _value; balances[_to] += _value; return true; } function getBalance(address _user) constant return