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<h2 class="bio-title">Solidity programmation</h2>
<p class="bio-text">
J'apprends actuellement la programmation de smart contracts en
Solidity.
<br />
Le code sur cette page est un test de l'utilisation du langage et de
la compréhension conceptuelle.
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<h3>Smart-contracts</h3>
<p>À propos du code d'exemple:</p>
<ul>
<li>
Test Remix・SimpleStorage.sol.<br />
Code pour la d'opérations en utilisant les variables et
différentes fonctions d'un contrat.
</li>
<li>
Test Remix・FundMe.sol.<br />
Code pour le dépôt et le retrait de fonds d'un contract.
</li>
</ul>
<p>Utilisation:</p>
<ul>
<li>
! Metamask et un réseau Ethereum de test sont nécessaires. !
</li>
<li>Créez un nouveau contrat sur le site Remix.</li>
<li>Collez le code.</li>
<li>
Après compilation, vous pouvez intéragir avec le contrat.
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Test Remix・SimpleStorage.sol<button class="copy-btn">
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<figcaption>
<pre><code class="language-solidity">
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
contract SimpleStorage {
// initialize to 0
uint256 favoriteNumber;
bool favoriteBool;
struct People {
uint256 favoriteNumber;
string name;
}
People[] public people;
mapping(string => uint256) public nameToFavoriteNumber;
function store(uint256 _favoriteNumber) public {
favoriteNumber = _favoriteNumber;
}
function retrieve() public view returns(uint256) {
return favoriteNumber;
}
function addPerson(string memory _name, uint256 _favoriteNumber) public{
people.push(People(_favoriteNumber, _name));
nameToFavoriteNumber[_name] = _favoriteNumber;
}
}
</code></pre>
</figcaption>
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<div class="row">
<div class="details-container">
<div class="content">
<h3 class="h3code">
Test Remix・FundMe.sol<button class="copy-btn">
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</h3>
<figcaption>
<pre><code class="language-solidity">
// SPDX-License-Identifier: MIT
// Smart contract that lets anyone deposit ETH into the contract
// Only the owner of the contract can withdraw the ETH
pragma solidity >=0.6.6 < 0.9.0;
// Get the latest ETH/USD price from chainlink price feed
import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";
import "@chainlink/contracts/src/v0.6/vendor/SafeMathChainlink.sol";
contract FundMe {
// safe math library check uint256 for integer overflows
using SafeMathChainlink for uint256;
//mapping to store which address depositeded how much ETH
mapping(address => uint256) public addressToAmountFunded;
// array of addresses who deposited
address[] public funders;
//address of the owner (who deployed the contract)
address public owner;
// the first person to deploy the contract is
// the owner
constructor() public {
owner = msg.sender;
}
function fund() public payable {
// 18 digit number to be compared with donated amount
uint256 minimumUSD = 50 * 10 ** 18;
//is the donated amount less than 50USD?
require(getConversionRate(msg.value) >= minimumUSD, "You need to spend more ETH!");
//if not, add to mapping and funders array
addressToAmountFunded[msg.sender] += msg.value;
funders.push(msg.sender);
}
//function to get the version of the chainlink pricefeed
function getVersion() public view returns (uint256){
AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
return priceFeed.version();
}
function getPrice() public view returns(uint256){
AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
(,int256 answer,,,) = priceFeed.latestRoundData();
// ETH/USD rate in 18 digit
return uint256(answer * 10000000000);
}
// 1000000000
function getConversionRate(uint256 ethAmount) public view returns (uint256){
uint256 ethPrice = getPrice();
uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
// the actual ETH/USD conversation rate, after adjusting the extra 0s.
return ethAmountInUsd;
}
//modifier: https://medium.com/coinmonks/solidity-tutorial-all-about-modifiers-a86cf81c14cb
modifier onlyOwner {
//is the message sender owner of the contract?
require(msg.sender == owner);
_;
}
// onlyOwner modifer will first check the condition inside it
// and
// if true, withdraw function will be executed
function withdraw() payable onlyOwner public {
// If you are using Solidity version v0.8.0 or above,
// you will need to modify the code below to
// payable(msg.sender).transfer(address(this).balance);
msg.sender.transfer(address(this).balance);
//iterate through all the mappings and make them 0
//since all the deposited amount has been withdrawn
for (uint256 funderIndex=0; funderIndex < funders.length; funderIndex++){
address funder = funders[funderIndex];
addressToAmountFunded[funder] = 0;
}
//funders array will be initialized to 0
funders = new address[](0);
}
}
</code>
</pre>
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