File size: 3,203 Bytes
9e9760c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | // SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
contract ArraysExercise {
// Declare state variables to store arrays of numbers, timestamps, and senders
uint[] numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; // Array of numbers initialized with values
uint[] timestamps; // Dynamic array to store timestamps
address[] senders; // Dynamic array to store sender addresses
uint256 constant Y2K = 946702800; // Constant representing the Unix timestamp for the year 2000
// Function to retrieve the array of numbers
function getNumbers() external view returns (uint[] memory) {
// Create a memory array to hold the numbers
uint[] memory results = new uint[](numbers.length);
// Copy the numbers from the state array to the memory array
for(uint i=0; i<numbers.length; i++) {
results[i] = numbers[i];
}
// Return the memory array
return results;
}
// Function to reset the numbers array to its initial values
function resetNumbers() public {
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
}
// Function to append new numbers to the numbers array
function appendToNumbers(uint[] calldata _toAppend) public {
// Iterate through the array to be appended
for (uint i = 0; i < _toAppend.length; i++) {
// Push each element of the array to be appended to the numbers array
numbers.push(_toAppend[i]);
}
}
// Function to save a timestamp along with the sender's address
function saveTimestamp(uint _unixTimestamp) public {
// Push the timestamp and sender's address to their respective arrays
timestamps.push(_unixTimestamp);
senders.push(msg.sender);
}
// Function to retrieve timestamps and senders after the year 2000
function afterY2K() public view returns (uint256[] memory, address[] memory) {
// Initialize counter for timestamps after Y2K
uint256 counter = 0;
// Count the number of timestamps after Y2K
for (uint i = 0; i < timestamps.length; i++) {
if (timestamps[i] > Y2K) {
counter++;
}
}
// Initialize memory arrays to hold timestamps and senders after Y2K
uint256[] memory timestampsAfterY2K = new uint256[](counter);
address[] memory sendersAfterY2K = new address[](counter);
// Initialize index for inserting elements into memory arrays
uint256 index = 0;
// Iterate through timestamps and senders arrays to extract elements after Y2K
for (uint i = 0; i < timestamps.length; i++) {
if (timestamps[i] > Y2K) {
timestampsAfterY2K[index] = timestamps[i];
sendersAfterY2K[index] = senders[i];
index++;
}
}
// Return timestamps and senders after Y2K
return (timestampsAfterY2K, sendersAfterY2K);
}
// Function to reset the senders array
function resetSenders() public {
delete senders;
}
// Function to reset the timestamps array
function resetTimestamps() public {
delete timestamps;
}
}
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