└── Adress book


/Adress book:
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 1 | // SPDX-License-Identifier: MIT
 2 | pragma solidity ^0.8.8;
 3 | 
 4 | import "@openzeppelin/contracts/access/Ownable.sol";
 5 | 
 6 | contract AddressBook is Ownable(msg.sender) {
 7 |     // Define a private salt value for internal use
 8 |     string private salt = "value"; 
 9 | 
10 |     // Define a struct to represent a contact
11 |     struct Contact {
12 |         uint id; // Unique identifier for the contact
13 |         string firstName; // First name of the contact
14 |         string lastName; // Last name of the contact
15 |         uint[] phoneNumbers; // Array to store multiple phone numbers for the contact
16 |     }
17 | 
18 |     // Array to store all contacts
19 |     Contact[] private contacts;
20 | 
21 |     // Mapping to store the index of each contact in the contacts array using its ID
22 |     mapping(uint => uint) private idToIndex;
23 | 
24 |     // Variable to keep track of the ID for the next contact
25 |     uint private nextId = 1;
26 | 
27 |     // Custom error for when a contact is not found
28 |     error ContactNotFound(uint id);
29 | 
30 |     // Function to add a new contact
31 |     function addContact(string calldata firstName, string calldata lastName, uint[] calldata phoneNumbers) external onlyOwner {
32 |         // Create a new contact with the provided details and add it to the contacts array
33 |         contacts.push(Contact(nextId, firstName, lastName, phoneNumbers));
34 |         // Map the ID of the new contact to its index in the array
35 |         idToIndex[nextId] = contacts.length - 1;
36 |         // Increment the nextId for the next contact
37 |         nextId++;
38 |     }
39 | 
40 |     // Function to delete a contact by its ID
41 |     function deleteContact(uint id) external onlyOwner {
42 |         // Get the index of the contact to be deleted
43 |         uint index = idToIndex[id];
44 |         // Check if the index is valid and if the contact with the provided ID exists
45 |         if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);
46 | 
47 |         // Replace the contact to be deleted with the last contact in the array
48 |         contacts[index] = contacts[contacts.length - 1];
49 |         // Update the index mapping for the moved contact
50 |         idToIndex[contacts[index].id] = index;
51 |         // Remove the last contact from the array
52 |         contacts.pop();
53 |         // Delete the mapping entry for the deleted contact ID
54 |         delete idToIndex[id];
55 |     }
56 | 
57 |     // Function to retrieve a contact by its ID
58 |     function getContact(uint id) external view returns (Contact memory) {
59 |         // Get the index of the contact
60 |         uint index = idToIndex[id];
61 |         // Check if the index is valid and if the contact with the provided ID exists
62 |         if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);
63 |         // Return the contact details
64 |         return contacts[index];
65 |     }
66 | 
67 |     // Function to retrieve all contacts
68 |     function getAllContacts() external view returns (Contact[] memory) {
69 |         // Return the array of all contacts
70 |         return contacts;
71 |     }
72 | }
73 | 


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