How to Capitalize the First Letter of a String in JavaScript?

Capitalizing the First Letter of a String in JavaScript

Capitalizing the first letter of a string can be useful in various scenarios, such as formatting titles or names. This article will explore how to achieve this in JavaScript while maintaining the casing of other characters.

Approach:

To capitalize the first character of a string, one effective method involves utilizing the charAt() and slice() methods. First, charAt() is used to retrieve the first character of the string, which is converted to uppercase. Subsequently, slice() is employed to extract the remaining characters of the string from the second character onwards. The end result is a new string with the first letter capitalized.

Code Implementation:

The code snippet below demonstrates how to implement this approach:

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

Example Usage:

Consider the following input strings:

• "this is a test"
• "the Eiffel Tower"
• "/index.html"

When passed through the capitalizeFirstLetter function, the output would be:

• "This is a test"
• "The Eiffel Tower"
• "/index.html"

Considerations:

It's worth noting that this approach assumes that the input string contains only letters and is not empty. For added robustness, error handling can be incorporated to address cases where the string is non-empty but does not contain any letters.

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