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How do I make the first letter of a string uppercase in JavaScript?

How do I make the first character of a string uppercase if it's a letter, 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"

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  • Using /^[a-z]/i will be better than using . as the prior one will not try to replace any character other than alphabets Commented Jul 6, 2019 at 5:56
  • 11
    @CodeManiac there are so many languages and letters except [a-z] Commented Sep 11, 2021 at 23:20
  • This is nice to avoid having to declare a string variable (that most other answers assume there is). For example: const date = new Date("2024年08月12日").toLocaleDateString("fr-FR", { weekday: "long", year: "numeric", month: "long", day: "numeric" }).replace(/^./, str => str.toUpperCase());. Using the string concatenation solution would require putting the locale date string in a variable first (or worse, repeating the full date method). Commented Aug 12, 2024 at 10:52

lang-js

AltStyle によって変換されたページ (->オリジナル) /