How to Capitalize the First Letter of a String in JavaScript

Capitalizing the first letter of a string is a common task in JavaScript. Here are a few ways to achieve this:

Using the toUpperCase() method and charAt() function

function capitalizeFirstLetter(str) {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

console.log(capitalizeFirstLetter('hello')); // Output: Hello

The charAt(0) function returns the first character of the string. We then chain the toUpperCase() method to capitalize this character. Finally, we use slice(1) to get the rest of the string (from index 1 to the end) and concatenate it back to the capitalized first letter.

Using regular expressions

function capitalizeFirstLetter(str) {
  return str.replace(/^\w/, (match) => match.toUpperCase());
}

console.log(capitalizeFirstLetter('hello')); // Output: Hello

The regular expression /^\w/ matches the first word character (letter, digit, or underscore) at the beginning of the string (^). We then pass a callback function to replace() that capitalizes the matched character using toUpperCase().

Using template literals

function capitalizeFirstLetter(str) {
  return `${str.charAt(0).toUpperCase()}${str.slice(1)}`;
}

console.log(capitalizeFirstLetter('hello')); // Output: Hello

Template literals allow us to embed expressions using ${}. We use the same approach as the first method, but with template literals for a more concise syntax.These are just a few examples of how to capitalize the first letter of a string in JavaScript. The choice depends on your personal preference and the specific requirements of your project.

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