How do I Capitalize Only the First Letter of a String in JavaScript?

Capitalizing the First Letter of a String in JavaScript

Question: How can JavaScript be used to capitalize only the first letter of a string, leaving the rest unchanged, regardless of its initial case? For example:

• "this is a test" should become "This is a test"
• "the Eiffel Tower" should become "The Eiffel Tower"
• "/index.html" should remain unchanged

Answer: To effectively capitalize just the first letter of a string, JavaScript provides an elegant solution through its capitalizeFirstLetter function:

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

This function employs two string methods:

• charAt(0) retrieves the first character of the input string.
• slice(1) creates a new string containing all characters except the first.

The result combines the capitalized first character with the original string, effectively capitalizing only the initial letter. Unlike modifying String.prototype, this approach offers enhanced maintainability by avoiding potential conflicts.

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