Finding uppercase characters within a string

Question

I am trying to write a function that decryptes an encrypted message that has uppercase letters (showing its a new word) and lower case characters (which is the word itself).

Answer 1

I'm not too sure I follow, but you can strip using the replace method and regular expressions

var str = 'MaEfSdsfSsdfsAdfssdGsdfEsdf';
var newmsg = str.replace(/[a-z]/g, '');
var old = str.replace(/[A-Z]/g, '');

In this case, newmsg = 'MESSAGE'.

Answer 2

EDIT

String input = "ThisIsASecretText";    

for(int i = 0; i < input.Length; i++)
{
  if(isUpperCase(input.charAt(i))
  {
     String nextWord = String.Empty;

     for(int j = i; j < input.Length && !isUpperCase(input.charAt(j)); j++)
     {
       nextWord += input.charAt(j);
       i++;
     }

     CallSomeFunctionWithTheNextWord(nextWord);
  }
}

The following calls would be made:

• CallSomeFunctionWithTheNextWord("This");
• CallSomeFunctionWithTheNextWord("Is");
• CallSomeFunctionWithTheNextWord("A");
• CallSomeFunctionWithTheNextWord("Secret");
• CallSomeFunctionWithTheNextWord("Text");

You can do the same thing with much less code using regular expressions, but since you said that you are taking a very basic course on programming, this solution might be more appropriate.

Answer 3

A simple condition for checking uppercase characters in a string would be...

var str = 'aBcDeFgHiJkLmN';
var sL = str.length;
var i = 0;
for (; i < sL; i++) {
    if (str.charAt(i) === str.charAt(i).toUpperCase()) {
        console.log('uppercase:',str.charAt(i));
    }
}

/*
    uppercase: B
    uppercase: D
    uppercase: F
    uppercase: H
    uppercase: J
    uppercase: L
    uppercase: N
*/