The map() method returns a new array containing the values returned from the callback function. We used the String.toUpperCase() method to convert each string in the array to uppercase. The Array.map() method returns a new array, it doesn't change the original array. ...
function ucfirst(str) { if (typeof str !== 'string') { return str; } return str.charAt(0).toUpperCase() + str.slice(1); }; console.log(ucfirst('hello!')); // Output: Hello! In the above code, we've added an if statement to make sure if the argument passed to ...
If you want to check if a letter is lowercase, you just have to lowercase theA-Zletters in the range. index.js functionisLowerCase(string){return/^[a-z]+$/.test(string);}console.log(isLowerCase(''));// 👉️ falseconsole.log(isLowerCase('A'));// 👉️ falseconsole.log(isLowerC...
constuppercased=names.map(function(name){returnname.toUpperCase();});constlowercased=names.map(function(name){returnname.toLowerCase();}); To learn more about JavaScript arrays and how to use them to store multiple pieces of information in one single variable, take a look atthis guide. ...
索引优化:如果经常需要对某个字段进行大写转换后的搜索,可以考虑在该字段上创建一个函数索引(Function-Based Index),将转换后的值存储在一个辅助列中,并对该列建立索引。 批量处理:对于大量数据的转换,可以考虑使用批处理的方式,分批次进行转换,减少单次处理的负载。 硬件升级:如果数据量非常大,且性能成为瓶颈,可以...
capitalize-first-letter-js is a JavaScript function designed to capitalize the first letter of each word in a given string.. Latest version: 1.0.2, last published: a year ago. Start using uppercase-util in your project by running `npm i uppercase-util`.
Lodash Uppercase - Learn how to use the Lodash uppercase function to convert strings to uppercase in JavaScript effortlessly.
Delphi 转换大小写字符(UpperCase、LowerCase) 1、UpperCase//转换成大写 functionUpperCase(const S: string): string; var Ch: Char; L: Integer; Source, Dest: PChar; be Delphi 7 大小写 其他 转载 mob604756fc5b03 2021-02-03 13:51:00
In JavaScript, there is no built-in function to check if every character in a given string is in uppercase format or not. So, we have to implement our function. Here, we will create a function calledisUpperCase(), an anonymous arrow function, to tell us whether all the characters in a...
In a React.js application, you can check if the first letter of a string is uppercase using different methods. You can use toUpperCase(), charCodeAt(), or a regular expression with the test() method