How to capitalize the first letter of a string

Paul Hudson    February 14th 2018    @twostraws

If you want to capitalize the first letter of a string without touching the rest of the letters, add this simple extension of String:

extension String {
    func capitalizingFirstLetter() -> String {
        return prefix(1).capitalized + dropFirst()
    }

    mutating func capitalizeFirstLetter() {
        self = self.capitalizingFirstLetter()
    }
}

Here’s an example to try it out:

let test = "the rain in Spain"
print(test.capitalizingFirstLetter())

Available from iOS 8.0

Did this solution work for you? Please pass it on!

Tweet

Other people are reading…

• How to get the lines in a string as an array
• How to load a string from a website URL
• How to load a string from a file in your bundle
• How to save a string to a file on disk with write(to:)
• How to loop through letters in a string

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.