Basic Javascript Algorithm

Question

What to do - Capitalize the first letter of the words in a sentence.

So, I solved it and was wondering is there any way to do it without making it an array with .split().

What I tried without turning it into a array -

The logic - First, turn everything into lowercase. Then scan the sentence with a for loop, if you find a space, capitalize the next character.

function titleCase(str) {
  str = str.toLowerCase();
  for(i=0;i<str.length;i++) {
    if(str[i]===" ") {
      str = str.charAt[i+1].toUpperCase();
      return str;
    }
  }
}
titleCase("I'm a little tea pot", "");

That code doesn't even run.

See [this](http://stackoverflow.com/questions/2332811/capitalize-words-in-string) question. — Vidul, Sep 18 '15 at 18:37
and this one: http://stackoverflow.com/questions/1026069/capitalize-the-first-letter-of-string-in-javascript — jsxt, Sep 18 '15 at 18:40
You might want to make check if you are reaching the last char of the array and then breaking the array by trying to reference the index outside of the scope: charAt[i+1]. if the array has 10 chars, and the i is at 9, then by reference i+1 you are trying to access index 10 which will through an error and stop the script, maybe this is why the code doesn't work. — Mohammed Joraid, Sep 18 '15 at 18:46
if(str[i]===" ") { is not correct it should be if(str.charAt[i]==" ") — syarul, Sep 18 '15 at 20:12
@ВидулПетров That answer only capitalizes the first letter of the first word, not first letter of all the words in the sentence. — Lavios, Sep 18 '15 at 20:15
@Lavios Think again: `s.toLowerCase().replace( /\b./g, function(a){ return a.toUpperCase(); } );` — Vidul, Sep 18 '15 at 20:18
Yup. You're correct! I had opened too many tabs, before i saw your answer and there was a similar looking code and i used that instead of this. :) — Lavios, Sep 18 '15 at 20:38
check this for the solution, if you want to do without regex https://jsfiddle.net/y5bcx9zx/ — syarul, Sep 18 '15 at 21:03

score 0 · Answer 1 · edited Sep 18 '15 at 19:23

0

I just used split() and replace to do that. You can have a look at my code.

function titleCase (str)
{
    str = str.split(' ');
    for(var i=0;i<str.length;i++)
    {
        str[i] = str[i].replace(str[i][0],str[i][0].toUpperCase())
    }
    return str.join(' ');
}

var mainString ="i am strong!";
titleCase(mainString);

edited Sep 18 '15 at 19:23

Alexandr Lazarev

12,554
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answered Sep 18 '15 at 18:55

Sanu Uthaiah Bollera

939
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1

question explicitly says "without using `.split()`" though – CupawnTae Sep 18 '15 at 19:38

score 0 · Answer 2 · answered Sep 18 '15 at 19:47

Here is one using replace + with a regex:

/**
 * @summary Uppercase the first letter in a string.
 * @returns {string}
 */
function uppercaseFirstLetters(string) {
    return string.replace(/[a-zA-Z]*/g, function(match) {
        return match.charAt(0).toUpperCase() + match.substr(1).toLowerCase();
    })
}

Basic Javascript Algorithm

2 Answers2