JavaScript provides several built-in methods for manipulating strings, including one called toUpperCase() which can be used to convert the first letter of a string to uppercase.
例子:在这里,toUpperCase()方法被调用str字符串,将所有小写字母转换为大写。得到的字符串,"HELLO WORLD", 被赋值给变量upperStr. Javascript conststr ="hello world";constupperStr = str.toUpperCase();console.log(upperStr);// Output: "HELLO WORLD" 输出 HELLO WORLD 注:amanv09...
How do I make the first letter of a string uppercase, but not change the case of any of the other letters? For example: "this is a test"->"This is a test" "the Eiffel Tower"->"The Eiffel Tower" "/index.html"->"/index.html" function capitalizeFirstLetter(string) { return string...
In this article, we'll learn to build a functionality that could capitalize only the first character of the string. Let's consider an example: const message = 'hello world!'; Let's say I want to make the h in the above string to uppercase. I could do that by selecting the first...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 /* (1)将所有的字符串内容变为大写字母 uppercaseString (2)将所有的字符串内容变为小写字母 lowercaseString (3)将单词的首字母小写变为大写字母 capitalizedString */NSString*str10=@"sayhelloworld";NSString*str11=[str10 uppercaseString];NSLog(@"str...
Check if First Letter Is Upper Case in JavaScript We can check if the first of a letter a string is upper case in a few ways. Let's take a look at some popular ones. toUpperCase() This is a built-in string method that returns the invoked string with only upper case characters: func...
JavaScript Code:// Write a JavaScript function that accepts a string as a parameter and converts the first letter of each word to uppercase. function uppercase(str) { // Split the input string into an array of words var array1 = str.split(' '); // Initialize an empty array to ...
2. JavaScript Strings are Case-Sensitive In JavaScript., the lowercase and uppercase letters are treated as different values. For example, let value1 = "a"; let value2 = "A" console.log(value1 == value2); // false Run Code As you can see, a and A are treated as different value...
js constnullVar=null;nullVar.toString();// TypeError: nullVar is nullString(nullVar);// "null"constundefinedVar=undefined;undefinedVar.toString();// TypeError: undefinedVar is undefinedString(undefinedVar);// "undefined" Specification ECMAScript® 2026 Language Specification ...
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...