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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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  • 16
    Re-read question: I want to capitalize the first character of a string, but not change the case of any of the other letters. Commented Nov 30, 2011 at 19:13
  • 2
    I know I did. I'd add one thing, in case the entire string starts capitalized: pieces[i] = j + pieces[i].substr(1).toLowerCase(); Commented Dec 20, 2012 at 21:16
  • 5
    Another solution to this case: function capitaliseFirstLetters(s) { return s.split(" ").map(function(w) { return w.charAt(0).toUpperCase() + w.substr(1) }).join(" ") } Can be a nice one-liner if it's not put into a function. Commented Mar 10, 2013 at 21:36
  • Would be better to first lowercase the whole string Commented Jul 6, 2016 at 10:36
  • 1
    Other than this function not answering the question, it's actually also overcomplicated. s => s.split(' ').map(x => x[0].toUpperCase() + x.slice(1)).join(' ') Commented Jul 28, 2017 at 18:10

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