Thread by @LearnWithSiv

SOLIDITY BASICS - 1 🛸🪐

Digest 6 of "Learn Blockchain, Solidity, and Full Stack Web3 Development with JavaScript – 32-Hour Course" by @PatrickAlphaC ⭐🤩

A Thread.🧵

#solidity #coding #blockchain #smartcontracts #web3 🚀

@PatrickAlphaC If you haven't checked out the previous threads covering the basics of blockchain, please do before getting started on this one! 🧱

https://twitter.com/LearnWithSiv/status/1530613513533591552

@PatrickAlphaC SOLIDITY ✨
- It is a programming language developed by Ethereum developers. 🔗
- Helps build smart contracts that run on Ethereum blockchain.

@PatrickAlphaC REMIX IDE 💻
- It is a desktop application that allows developing and deploying smart contracts easily. ✔️
remix.ethereum.org

@PatrickAlphaC WRITE YOUR FIRST CONTRACT 🤩
- Create a new file - SimpleStorage.sol
- Find the full code on the GitHub repository 👇🏽
github.com/PatrickAlphaC/…

@PatrickAlphaC Topics covered 👇🏽
✅ Licence Identifier
✅ Solidity Version
✅ Contract
✅ Data Types
✅ Variable Declaration
✅ Functions
✅ Function Visibility Specifiers
✅ Deploy and Run Transaction

@PatrickAlphaC 1. LICENCE IDENTIFIER (optional) 🗒️
- This line is optional in most cases and is commented out.
- We use:

//SPDX-Licence-Identifier: MIT

@PatrickAlphaC 2. SOLIDITY VERSION 📎
- We begin by mentioning the version of the solidity language used.
- The caret symbol represents that any version above that mentioned is acceptable. ✅

pragma solidity ^0.8.7;

NOTE: The semicolon is MANDATORY at the end of each line.

@PatrickAlphaC 3. CONTRACT 📜
- The "contract" keyword is used to define contracts in Solidity.
- The keyword is followed by the name of the contract.

contract SimpleStorage{
}

- Contents of the contract are enclosed within the curly brackets {}.

@PatrickAlphaC 4. DATA TYPES ⌨️
- Some of the data types available are:
-> uint256 - unsigned integer (i.e., whole nos) represented using 256 bits.
-> int256 - integers (i.e., +ve and -ve nos) represented using 256bits.
-> bool - boolean values such as True and False.
-> address

@PatrickAlphaC 5. VARIABLE DECLARATION
- Syntax: variableType visibility variableName;

uint256 public favoriteNumber;

- When not initialized, the variable is set to 0 by default.
- If visibility is not mentioned, it is considered to be "internal" by default (more of that is discussed below)

@PatrickAlphaC 6. FUNCTIONS 💡
- Functions help us execute a subset of code when called.
- The "function" keyword is used to declare a function.
- Syntax:
function functionName (parameterType parameter) visibility {
//type here
}
- Ex:
function store (unit favNum) public{
}

@PatrickAlphaC 7. FUNCTION VISIBILITY SPECIFIERS 👁️
- public: visible externally and internally; creates a getter function
- private: only visible in the current contract
- internal: only visible to the current contract and its children
- external: only visible externally

@PatrickAlphaC 8. DEPLOY AND RUN TRANSACTION ✅
- After compiling the code, set the Environment to Javascript VM (London)
- It is a fake local blockchain where we can simulate our transactions without having the need to wait for them to go through on a testnet.
- Deploy. 🥳

@PatrickAlphaC 🚨 Note 1
Every smart contract has an address.

🚨 Note 2
-Deploying a smart contract is the same as sending a transaction. Therefore some gas is used.
- Sending ETH requires 21,000 gas units.
- Complex transactions consume more gas.

@PatrickAlphaC That was 30 minutes of the course summarized for you. 🙃

@PatrickAlphaC If you're a web3 enthusiast, wanting to explore, learn and grow as a developer, do watch this video and learn along with me.

@PatrickAlphaC Digest 7 (summarizing the next few minutes of the course) coming soon... 😉

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