Converting First Charcter of String to Upper Case

This question already has an answer here:

How do I make the first letter of a string uppercase in JavaScript? 69 answers

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You are almost there. Instead of uppercasing the entire string, uppercase only the first character.

Array.prototype.myUcase = function()
{
    for (var i = 0, len = this.length; i < len; i += 1)
    {
          this[i] = this[i][0].toUpperCase() + this[i].slice(1);
    }
    return this;
}

var A = ["one", "two", "three", "four"]
console.log(A.myUcase())

Output

[ 'One', 'Two', 'Three', 'Four' ]

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If you need the upper case for presentation to your views, you can simply use css for do so!

div.capitalize:first-letter {
  text-transform: capitalize;
}

here is the complete fiddle example: http://jsfiddle.net/wV33P/1/

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Use this extension (as per previous SO-answer):

String.prototype.first2Upper = String.prototype.first2Upper || function(){
 return this.charAt(0).toUpperCase()+this.slice(1);
}
//usage
'somestring'.first2Upper(); //=> Somestring

And for your array using map in combination with this extension would be:

var numArray = ["one", "two", "three", "four"]
               .map(function(elem){return elem.first2Upper();});
// numArray now: ["One", "Two", "Three", "Four"]

See MDN for explanation of and shim for the map method

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