Upload Arrays.txt

Arrays.txt

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+// 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;
+    }
+}