Make first letter of TEXT INPUT uppercase [closed]

Im new to JS but I think the post title does its job. From what i saw by googling this problem, there’s lots of ways to solve this issue. But basically, theres a text input field, the user writes ‘paris’. how do i make ‘paris’ turn into ‘Paris’. I need to get the input.value and change it. Obviously, i dont hardcode the sentence, the user chooses the word and i get it as a text input value.

let cityName = inputCity.value;
let latestSearch = firstUpperCase(cityName);
   
function firstUpperCase(cityName){ 

    //Assign touppercase() to first letter of string, then add the rest of the sentence by using the actual sentence with the first letter sliced. 
    latestSearch = cityName[0].toUpperCase();

    return latestSearch;
  }

Answer

For your question what I understand truely, you want to uppercase first letter of input string that may or may not contain more than one word. Following this, this code might help

let userData = "lorem ipsum the world"
let newString = userData[0].toUpperCase() + userData.slice(1)
alert(newString)

In case you need every first letter of each word uppercase, this might help

let userData = "lorem ipsum the world"
userData = userData.split(" ")
userData.forEach(function(word, index){
    userData[index] = word[0].toUpperCase() + word.slice(1)
})
newString = userData.join(" ")
    alert(newString)