Learn solidity with the Register project

This is a set of smart contracts examples to learn Solidity fundamentals

Register-01.sol is a very basic smart contract.

Then will be created new versions, adding Solidity concepts in each of them.

I suggest to try it in Remix

Solidity concepts

Register-01

• Comments
• License-Identifier
• Solidity version: pragma command
• Creating a contract: contract command
• Variable type: string
• Variable visibility: private
• Creating a function: function
• Function visibility: external
• Function types: view
• Function with parameters
• Returning data in functions

Register-02

• Variable type: uint
• Variable visibility: public
• Initializing a variable
• Increasing numbers

Register-03

• Initializing a contract: constructor command

Register-04

• Variable type: address
• Owner concept
• Global variable: msg.sender
• Checking conditions: ifcommand
• Permissions and access concepts

Register-05

• Managing conditions: require command
• Error messages

Register-06

• Function modifiers

Register-07

• Events

Register-08

• All together 1
  • types string, uint, address
  • msg.sender and owner, constructor
  • require, function modifiers, events

Register-09

• Array

Register-10

• Loop structures: for
• Local / memory array

Register-11

• Key -> value concept: mapping command
• Access control: creating a whitelist using a mapping

Register-12

• Enum concept

Register-13

• Structs

Register-14

• Combining mapping and struct
• One struct per address
• You can only modify your own struct, no whitelist

Register-15

• Combining mapping and array
• Each address has a mapping with array of structs