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Arrays.sol
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Arrays.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;
contract ArraysExercise {
uint[] numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
uint[] timestamps;
address[] senders;
uint256 constant Y2K = 946702800;
function getNumbers() external view returns (uint[] memory) {
uint[] memory results = new uint[](numbers.length);
for(uint i=0; i<numbers.length; i++) {
results[i] = numbers[i];
}
return results;
}
function resetNumbers() public {
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
}
function appendToNumbers(uint[] calldata _toAppend) public {
uint _counter = _toAppend.length;
for (uint i; i < _counter; i++) {
numbers.push(_toAppend[i]);
}
}
function saveTimestamp(uint _unixTimestamp) public {
timestamps.push(_unixTimestamp);
senders.push(msg.sender);
}
function afterY2K() public view returns (uint256[] memory, address[] memory) {
uint256 counter = 0;
for (uint i = 0; i < timestamps.length; i++) {
if (timestamps[i] > Y2K) {
counter++;
}
}
uint256[] memory timestampsAfterY2K = new uint256[](counter);
address[] memory sendersAfterY2K = new address[](counter);
uint256 index = 0;
for (uint i = 0; i < timestamps.length; i++) {
if (timestamps[i] > Y2K) {
timestampsAfterY2K[index] = timestamps[i];
sendersAfterY2K[index] = senders[i];
index++;
}
}
return (timestampsAfterY2K, sendersAfterY2K);
}
function resetSenders() public {
delete senders;
}
function resetTimestamps() public {
delete timestamps;
}
}